Do the 89-90 and 91-94 Speedos match up?

[Panther37]

I want to know if the 89-90 and 91-94 speedo gauge faces are interchangeable. What I mean by this is if you put a 91-94 speedo gauge face and swapped it with the one in the 89-90 cluster, would the gauge be correct? I know that the 91-94 gauge face says 60MPH=1024rpm. Does the 89-90 gague face say the same thing?

This is why I want to know (http://www.zilvia.net/f/showthread.php?t=80904)

[Panther37]

I've been looking at the two and I'm leaning toward them not being compatible.