I've got 2 areas of drywall that I need to repair. One area is in the attached garage, where the walls are the inside, backing to the house. The second is an interior house wall.

I'm assuming because of code, the garage walls have fire proof drywall. Is it possible to tell just by looking at it?

Because I only want to buy one sheet, is there any reason (pros or cons)why I can't use the same drywall type (assuming it must be fire proof) in the house?

Thanks,
Mike