What parts will interchange between a 98 ford ranger XLT 4.0 extended cab 4x4 and a 94 ford ranger 3.0 extended cab2 wheel drive?

Honestly, very few, if any. 1998 was the beginning of the third generation of Ford Ranger, whereas 1994 was the second year of the Gen II models. There was much which was changed in the years between, so don't expect a high commonality of parts at all.