in the first blog post where the announced that you could carry over your save they specifically said "It’s also the plan to bring saved games from FM24 into FM25, despite the big changes coming for FM25" they were specific in mentioning FM24 and FM25 which makes it seem like it is only going to be from one year to the other. Also if you read down the main reason they are doing it is for those that play on game pass since once the new game comes out, they can no longer sell the older one legally so they disappear and you remain stuck with just your game files and no way to play them. (SI didn't give this explanation but that is basically the reason but I could be wrong)