I like the old Mongol skins and models more from 2.1. I wonder how I can switch the skins and models from 2.1 to 2.4?
I notice that the unit cards are from 2.1, but the actual units are taken from other mods.

I have looked inside those files, but they don't look like skins and models of Vanilla, so I don't know how to navigate them.

Can you guys help me to elucidate the way to switch these units from 2.1 to 2.4?