Well thanks to reply :)
But i'm still not sure, I copy copy/paste the text at the end of the jam overview:
Do I have to redesign a game newer than the console I’ve chosen?
No, as an example you can take an Atari 2600 game and redesign it for the SNES
Still got questions? Be sure to ask your question in the discord server or DM one of the hosts directly!
As I'm pasting this I realize I should ask on Discord ;)