In my research, it looks like the two are different. Most of the Del Sol lips are curved in two stages to the tip - the Civic ones are smoothly arched.
What we should do, is all go out to our cars, and list our lip dimensions. Because I'm looking for something nice for my 91, front and rear. No one is making the rear. If I can get the EG rear lip, I would be happy as a clam.