Is there a CRX that is the mechanical twin to a Civic HB?

For example...would a 90 CRX DX be mechanical likeness of the 90 STD HB?

Just trying to get an idea because I found a manual that I can print out online for a 91 CRX...it says it is compatible with most 88-91 CRX's but I was under the assumption that a CRX "mechanically" is the same car as the civic...just basically the body is different.

Let me know before I spend the time printing out this manual.

What CRX is "most" compatibly similar with my 90 Civic HB STD???

Jason