Hi smarcin,
You'll only need to replace the OCS denise (8362) with an ECS one (8373).
To upgrade the kickstart rom, you'll also need the extended CDTV roms v2.30. The latter ones come in pairs. If you only change the kickstart rom and not the extended roms, you'll then lose the cd-drive, as the required driver is in those extended roms and the stock ones dont work with kicks > 1.3
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