Yes you can swap ecu into new car fairly easily
see here
https://www.ft86club.com/forums/showthread.php?t=102810
If its got ecutek licience in ecu dont change vin in ecu or you eill loose licience just swap in in as above, and you just have to put up with vin not being correct
The incorrect vin can cause issues in some states during smog checks though
if someone had same transmission car same year they could keep tune in ecu assuming they had same engine mods as you or bought all your bits
if not they can still swap ecu and use ecutek licience and reflash with suitable tune for any year or transmission car with ecutek. but again dont change vin or you loose licience in ecu.