I also thought about the same thing and asked the tyranny shop. They said that the final drive gears won't swap between these transmission, HF and VX, even though they are very similar.
Sad side story
I found a complete 88' CRX HF at a Pick and Pull yesterday, went home to get the tools I need to pull everything off. Then I came back today and the car was crushed already! What!!!!!!
It was there for only 2 months while old junker have been sitting since April. What gives!!!!