Transferring Game Data

Hey there yall, I recently got Battlefront on Steam and I wanted to transfer everything I unlocked while playing it originally on my Xbox years ago. But the problem is that my Xbox account is linked with a different EA account than the one I use, now and I really don't want to have two separate accounts. But while trying to unlink my original account, I was warned that it wouldn't transfer purchases. Does anyone know what stays/ gets lost if I change accounts?