Just a question about my dash guages..

I've just blown my RS's non-VTEC b18b motor and swapped a b18c1 motor in its place. Now, my tech says the b18b's dash gauge will be just fine, but doesn't the ECU report tach et al. differently than the b18c1's ECU?

I'd like to put an AC EL gauge face in there... can I put a GSR AC EL gauge face on the b18b gauge bezel? In the end, I want a GSR AC EL gauge. Let me know what I gotta do (one of the two below options):

b18b bezel with GSR faces?
b18c1 bezel with GSR faces?

BTW: I'm not looking for opinions here, just facts about compatability.

Thanks!