Can any one tell if the Atlas True Track system is compatable with all other N scale track? What is the difference between code 80, 55 etc track? Will my Atlas Train Man N Scale set (loco and stock) work on all code track? I am new to the hobby and your input is appreciated!

I recently purchased an Atlas Trainman N Scale set including their  N Scale Code 65 "True-Track". Are all N scale locomotives and rolling stock compatible with any N scale track or do I have to use code 65 track?