Whats the difference between supercharger kits from 96-98 and 99-04 GTs

Whats the difference between supercharger kits for 96-98 and 99-04 GTs

I recently purchased a Vortech S trim kit with aftercooler for a 96-98 Gt. But i am wondering if i decide to sell my 97 would it work on a newer 99+ GT and what modifications would need to be done? I say this because they look similar besides diff intake manifold and cams.
 
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