If Tom travels to the future, he would find that magic has evolved. Harry, having grown up in this more advanced magical world, would be more accustomed to the new types of magic and magical devices. For example, Harry is familiar with things like the Marauder's Map which uses a complex form of magic. Tom would need to adapt to these new forms of magic. However, Tom's ability to quickly learn and his ambition might make him catch up fast. He might also bring a different perspective on magic that could even surprise modern wizards with his unique interpretations of spells and magic theory.
In the past, Tom's magical abilities were already quite strong even as a young student. His natural talent for magic was evident. However, if Harry travels back in time, he would bring with him the knowledge and skills he has learned in his own time. So in terms of spellcasting knowledge, Harry might have an edge as he knows spells that were not yet invented or commonly known in Tom's time. But Tom's raw power and his understanding of magic from his own era's perspective would be formidable.
When both are in a different time period, say an ancient time in the wizarding world, their magical abilities would be tested in different ways. The magic in ancient times might be more raw and less refined. Tom's natural inclination towards the dark arts might give him an advantage in some ways as he could quickly adapt to the more primal forms of magic. Harry, on the other hand, with his strong moral compass, might be able to find a way to use the magic in a more positive and creative way. Their different approaches to magic based on their personalities and experiences would make for an interesting comparison in any time - traveling scenario.
Chapter 302, ", The Mechanical Throne", is the clearest early answer because it turns Matins's situation into a concrete plot event. The chapter gives readers a real answer by opening on Cai Minjin was so angry he was steaming, yet he still had to deploy... and ending on Indeed, if possible, they would love to have every key city equipped....
Chapter 190, "Wipe Out the Jungle", is the clearest early answer because it turns Jason Morgan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After the wave of Aberrant Beasts receded, the dire situation at... and follows through with Manor lords turned Alliance officials were unlikely to change much....
Chapter 189, ", Allied Air Force, Ace Pilot Requests to Enter the Battle!", is the clearest early answer because the buildup finally cashes out in a real clash. Early on, Ace pilot, requesting to engage!" "Enemy spotted at twelve o'clock!".... By the end, They fired the six heavy missiles carried by the Wind Falcons, then....
Chapter 250, ", Subtle", is the clearest early answer because it turns Extinguishing Brigade's situation into a concrete plot event. The chapter gives readers a real answer by opening on On the day of the incident at Heijian Star, Gu Hang was already... and ending on In addition, there were over a hundred Wind Falcon aircraft in the....
Chapter 300, ", Battle for Command Authority", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Although it could not be said that the entire Planetary Defense Army... and follows through with The war indeed had to be fought swiftly, for sustaining such a....
Chapter 257, ", They Struck First", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter turns that into something concrete by moving from What does Gu Hang think about Heijian Star? to Many of the family's past trade routes, relationships, and resources.... What makes it stick is that the chapter closes with But now, she could endure it, showing only a slight dissatisfaction, "I'm not blind to the potential.
Chapter 249, ", Hold for 8 Days, the Governor Will Arrive", is the clearest early answer because it turns Knight Titan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In the past, during the many battles on Rage Owl Star, his troops... and follows through with In eight days, I will arrive.. By the close, The dispute arose when Luman told Gu Ming that out of the eight..., and the chapter closes with "Hold for eight days.
Chapter 240, ", Didn't I Die?", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter turns that into something concrete by moving from Polar Industrial City, the headquarters of the group. to We will depart immediately once the ship from the Sisterhood arrives.. What makes it stick is that the chapter closes with What is this now?, which gives Gu Hang a stronger narrative position and pushes the faction conflict onward.
Chapter 205, "The Soldier King Can Achieve It", is the clearest early answer because it turns Plague Fly Swarms's situation into a concrete plot event. The chapter turns that into something concrete by moving from It must be emphasized that he was not at his full strength,... to He managed to escape, but the other two were not so lucky, nor did....
Chapter 147, ", Offensive Initiative (6k subscriptions please!)", is the clearest early answer because it turns Reed Meshako's situation into a concrete plot event. A useful checkpoint is the way the scene starts with waaagh!!" Roars of battle echoed from the numerous orc youngsters... and follows through with Going to the forefront, even for him, wasn't much different in combat....