The first link has at least some errors in the 88-91 section. I know that the HF transmission has taller gears
and a taller final drive than the DX transmission does. That list shows the same final drive as the DX.
Here's another BBS post listing gear ratios for the 88-91 CRXes. I believe that the Civics had the same ratios:
The CRX Community Forum :: View topic - D-Series Clutch and Gear Ratio information
-soD