Yes, you can swap the axles from any 8" as long as the length is correct. It's been a while since I've seen the info on this as I still run factory 4 lug axles, but it seems that, as long as your axles are the correct length, you can use drums from a Ranger as well. But I don't recall what year you'd have to get them from.
As for the 8.8 from an Explorer, I don't know if any of them are an actual bolt in. And, from what I am finding through internet searching is that the Explorer rear is roughly 2-1/4" wider than that of the II's 8". I know that they have been swapped into a II, but I don't know if the perches are located properly. But I also understand that the 8.8 is super-simple to narrow and as long as you have the capability to weld you can put the perches in any location that works for you. But as far as a bolt in, I don't think that they are.
Here are the 2 pages where I retrieved all of this info, someone else may know more about this topic than I do....
Ford 8.8-Inch Rear Axle History & Specs, identification tips, axle codes, spline counts, dimensions, and Ford Ranger & Explorer applications.
therangerstation.com