CotG hack in two CDs?

I was considering the idea of making CotG in 2 different ROMs... (if i'm not wrong i heard Tsushiy made the same with his hack)

No FF6T is on one ROM. He expanded the monsters that's all.

Loading the save from Disc 2 you'll still be in the same room, but since it will be another rom with changed stuff, it will start WoR story from there.

The only way to do that is to rename the SRM file to the name of the second ROM.

Yet there's something i don't like: is there a way to avoid that someone can load a random save file and magically access the second disc? the same for loading that save on disc 1 and being able to skip something? I cannot tell it for sure but maybe in ROTDS 1.3 it's not possible to do that...

It's not possible to load a vanilla save because it breaks the mod due to SRAM modifications. It was not made in a way to prevent people using save files found on the internet, at least it wasn't the sole purpose of those modifications. If you want to avoid someone of using a "random" save, make your mod to be unplayable with a vanilla save.

Edit: This is not even a 100% sure way to prevent cheating or event skipping. One could use the first save of your hack and then edit the SRAM directly in order to skip parts.

Edit2: Also don't use the word "CD" when talking about a SNES hack. It is really misleading :P