I went to day to change all the fluids in my Cherokee for the first time since I got it. I felt like an idiot when I was asked what diff I had

. Also it donned on me that I do not know how to tell the differences. For those before you say something I am a Heavy Equipment Mechanic, if it is not CAT yellow I don’t know a lot about it . So could some tell me or point me in the right direction on how to identify them.
Thank You