It's an IROC Z28. They are the same thing. they were the same in between 86-69(not positive on those years). iroc stands for international race of champions. once the license to use the name expired, the iroc z28 returned to just z28.
it should cause the iroc and the 94 camaro use the same transmission and the 94 v6 camaro transmission will fit the 94 z28 the only problem is that if you are a tire kicker and its a stick shift it wont hold up to the power but if its a automatic you should be fine