I finally changed oil for 2 diffs and transfer case and thinking it's my turn to contribute something here.

Mine is 2010 4runner I believe it is 5Gen. I would like to say, Diffs and TC are exactly same as the picture showing on the first page of 4GEN if it is as described by OP. But, somehow dealer provided 6 gaskets there are 3 of them don't fit. What they give to me, based on receipt, same as the one listed here in first page. So, I had thought it is correct but they are not.

Dealer give to me 3 small, 2 middle, and 1 large (cooper). Due to the receipt, they are 12157-10010, 94030-18008 and 94030-24003.

When I doing the work, I noticed, other than the large cooper one for Front Diff drain, rest are same (or similar) middle size of gasket. None of 3 small can be put in.

I ends up reuse 3 of them for fill as I cannot drive out to purchase anything without my ride is ready. I am little worried if there is problem for reusing them. They call crash washer, and I am actually saw it is crashed when I wrench them in indeed. Should I get correct washer and redo the job?