Collab Doesn't Keep Consistent Instance ID

Hi, I'm currently working on a game with a friend using unity collab. In the process, I used JSON files to save tilemap information to later use to read and create light-weight GameObject instances. When creating the save data, I store the information of each tile via its instance ID, the problem is that my friend's files all have different instance IDs to mine, therefore reading the JSON file only works for me. Is there a way to guarantee identical instance IDs between our projects or would we have to approach the matter differently?