SBROM

Is its possible to use an SNROM board for reproduction of an SBROM game? If yes, are there changes that have to be made? Thanks!

From SxROM series boards

SBROM: 64 KiB PRG, 16-64 KiB CHR ROM, no WRAM
SNROM: 128-256 KiB PRG, 8 KiB CHR (almost always CHR RAM), WRAM with optional battery

This would require the usual rewiring for PRG ROM but a bit more extensive to switch the CHR side from using RAM to using ROM. If you need to use a donor, I imagine a donor using SFROM or SLROM might be easier.