You're going to have a bunch of conversion to do, I believe. The Explorer RAP's in general require external relays for most functions. Although similar, and using the same connectors, the wiring is QUITE different.
I went and got some Explorer RAP's hoping to get the alarm feature, but I decided it was going to be too much trouble.
If you get one from a JY, take out the board and look. If you see the black relays all over it in the same configuration as your Ranger, you may be okay. I haven't seen the latest Explorer RAP's so they may be different. But my '02 has the relays for the doors and horn integrated into the CSM and so the Explorer one's I got wouldn't work.
Bob, is the '02 Explorer RAP more like the Ranger with relays integrated?