Your Explorer engines will also have a roller cam and lifters as was said.
There are some differences between years and models, (talking more than just Explorers here) such as timing covers, water pump lengths, etc. But the big one you need to watch out for is the one for external balance. The 302 has used two...28 oz and 50 oz. Early stuff is 28. All later stuff is 50. Almost all stroker stuff is 28. But for what you are doing, they are both 50 and the long blocks will interchange just fine. This is assuming both are from Explorers.
I do have one caveat to throw in there though. It is possible you could get one engine with a P head and one without. If that happens, get the exhaust manifolds with the new engine. It's possible the ones you have won't work due to spark plug location. You could also run into a problem with one internal EGR and one external. Swap to what your vehicle has if you can. Or now would be an excellent time to upgrade to headers.