Manual transmission question on a Jeep wrangler 4.0?

Q: I have a 2000 jeep wrangler 4.0 with a manual tranny. I wanted to change all my fluids before the winter here (im in upstate Ny, ft drum) started. I looked in manual and it said only use Mopar, im assuming because its Chrysler affliated. A mechanic said its just reg. 80-90 gear oil, so i changed it but now i looked online and it says use 75-90. Do I need to empty what I used or are they pretty similiar where it wont matter?

A: there's not much difference in the 2, I'd just leave the 80/90 in

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