I don't know the price you paid (or will pay), but might not be a bad deal even just for the interior bits you want.
If you are serious about the engine swap, do some thorough studying on what will be needed. Even though they are both V6 RBVs, it isn't just unbolt one engine and bolt the other in. Transmission bolt pattern is different so that will need to be swapped. The engine computer and wiring is different to it'll need to be swapped. The PATS systems were different between 01 and 04, so you'll need to investigate that as well and what will be needed to make them cooperate.
Not saying the engine swap is a bad plan, just be sure of what you are getting into and that you retain enough parts from the Explorer to make it a functional swap. Presumably you'll be scrapping/selling what's left after you;ve harvested your parts and not have it sitting in the pasture for the next several years, you don't want to get rid parts you're going to need along with it.