Inside door panels are the same, fenders are not because the corner lights are different, hoods are the same. Now looking at that kit heres what you are going to have problems with. The side skirts won't fit because the CRX is quite shorter than the Civic. The door caps should fit. The only difference in the Civic to CRX door is that they're cut down shorter at the B pillar. The front fenders won't fit too nicely because the corner lights are different. Now, you could try and swap out the corner lights with a CRX and then the fender and bumper might line up much nicer. The rear fenders you might as well throw in the trash because they aren't even going to be close to fitting. The hood will fit and the spoiler won't. Unless you are extremely skilled at working with fiberglass I wouldn't waste the money. Check out
www.passwordjdm.com for their SiR front end conversion. It's OEM parts so you know they'll fit and it looks fine. Throw on a cf lip and cf side skirts and your car would be way hotter than having a plastered on ghetto CRX kit.