USA and World are direct board swaps: Single board, ... Piece 'O Cake.
Exotica is a WHOLE other matter.
There an Exotica upgrade kit that will convert a USA cab,
but it has several key additional components.
For one thing I believe the driver/steering board is different,
and the wiring harness needs several additional power lines.
The monitor however is the same for all 3 games.
You can run the "Jamma portion" of an Exotica PCB directly in USA cab,
but the controls (steering/pedals) won't work without the full upgrade kit.
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I actually had a complete Exotica boardset ready to transplant into my USA cab,
but I was missing a few key parts, so I sold the boardset (...awhile ago...)
and upgraded to World instead.
I'd still like and Exotica one day....
;-)
Steph