Unless you are making an entirely new game mode (like survival of the fittest) then there is no need to do a TC mod. Going TC will limit your stackability severely (making it very likely that trying to add a mod will not work, or will crash the game) and it is essentially creating an entirely new game. So I doubt there will be much compatability between saves. It is likely that you would actually still retain any new content from the game, as long as you didn’t edit something specifically that would block that content (dino spawns, workbenches, stuff like that).