Most of them are interchangable unless explicitly stated.
(This info is probably outdated, since I haven't messed with FCD's in years.)
The older Racing Beat ones (metal case) could be used on any model?
The only one that I know that doesn't work is the Trust / GReddy one - this unit is specifically listed as a Kouki FC turbo only application.
Trust me, I tried - I slapped one on my old set-up on my 1987 Turbo II, and it didn't prevent the overboost fuel-cut with the stock ECU. :P
-Ted
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