ZN1 Coolboarders conversion

Hello Guys
I got a CoolBoarders game on ZN1 board its a funny game but i wish if is possibile to convert it to TondemoCrisis ( yes crazy japan game ) i love it.

Same board but hey, half of components on.

Coolboarders:


Here TondemoCrisis board:



Why is missing copletely audio part on top board ?

Afaik, Coolboarders only uses the additional audio on the rom board for the announcer.