Not much. Manga Rock was an illegal platform for accessing manga, while Acchi Kocchi is an original manga with its own legitimate distribution channels.
It's hard to say for sure. Spiderman has his classic skills and experience, but Black Spiderman might have some unique powers or tactics. It could go either way depending on the situation.
You can start by sketching the basic outline of Lee's figure. Focus on getting the proportions right. Then, add details to show the action like dynamic poses and expressions.
The relationship is shown as a dynamic one, with Spider-Man often seeking guidance and support from the Avengers while also contributing his unique skills.
There might be some creative or artistic way to combine the two, like a comic strip featuring a character traveling with a suitcase. But generally, they belong to different domains. Comic strips focus on entertainment and visual storytelling, and suitcases are practical items for storage and transport.
The world-building and character development are usually key aspects that are successfully brought to life in anime. Also, the plot progression and themes can be translated quite well. However, some nuances in the manga might be lost in the adaptation process.