Usually, pepita refers to the inner kernel.

i think for some people and in some circles they are interchangeable, but i have also heard people and recipes specify, saying that a "pumpkin seed" is the entire seed, including the outer, crunchy, kind of milky-white husk thing, and that a "pepita" is the smaller, more tender, kind of darkish green inner seed. i hope that makes some kind of sense!

yes