I can't answer this question because I don't know the specific situation of the manga BAR and the manga SHOW. Please provide more information such as the genre, author, theme, etc. to better answer your questions.
Overall, it has some level of accuracy. However, to make it more suitable for TV, certain plot points and character developments might differ from the comic.
Definitely. Preacher the show is based on a comic. The comic provided the framework and concepts that were adapted for the television version, with some creative interpretations and changes to suit the medium of TV.
There are indeed comics based on Grimm. They usually expand on the storylines and characters from the show, offering fans more content to enjoy. However, the availability might vary depending on your region and distribution.
The Boys comic and the show aren't completely identical. The show often makes changes to make it more visually engaging or to fit the TV format. But at the core, they share the main themes and concepts.