yes it is.

depends on which d15b block you have. like the crx hf which is a d15b6, CAN'T have ANY head swapped onto it AT ALL. it only has 8 valves, not 16 like the others. if it's an hf, get rid of the car. don't even bother swapping the engine since you can't swap the head. the vacuum lines will only fuck you since they are completely different. and there's like 17 different hoses, when all the other crx's and civic have like 5. i had one. i didn't know you couldn't do it. i bought everything, ripped apart my engine, and found out the hard way. wasted $400 and still had 62hp (that's what the crx hf's have in 88-89, 72hp for 90-91).

The block model was not mentioned so it light of that......Do the damn thing. Some differences you might run into though are Head studs, timing belt and which dizzy wires go where.
What head/block combo are u trying to run?