There could be differences in details and expressions. The manga panel might show more nuanced emotions or fine details that the anime might not fully capture.
The movie 'We Were Soldiers' is based on a real battle. In fact, the soldiers had to deal with real logistical problems like ammunition supply and medical evacuation. In the movie, some of these aspects might be adjusted for the flow of the story. The movie shows some relationships between soldiers in a more Hollywood - style, which is a bit of a fictional take. But overall, it does a decent job of portraying the courage and sacrifice of the real soldiers.
Guts is purely fictional. It's a concept or character that exists within the realm of imagination and creative storytelling rather than being based on reality.
The movie has some inaccuracies. For instance, the timings of some attacks and counter - attacks might be tweaked for drama. But it does get a lot of things right too. The equipment shown is generally accurate to what was used at that time.