[Baker]

This has come up before with no REAL answer or proof, so here it is.

YES, 88-91 Civic hatch door panels WILL fit 88-91 Crx's as long as you get the correct panel for your seatbelt application. Meaning if you do not have door mounted seatbelts, then you get the door panel that does not have the seatbelt pass through in it, if you do have a Crx with the seat belt mounted to the door, then you would get a door panel WITH the seat belt pass through in it.

Proof that Civic hatch door panels fit Crx's and end the myth that the Civic door is longer and the panel would not fit:

 

[Baker]

When i asked on here awhile back if the panels were interchangable, nobody answered that they knew for SURE, which i why i posted this.

As for the doors being interchangable, i am unsure.
My guess is that they would be.