You won't lose any long term data by disconnecting the battery with any reasonably modern ECU. If your swap is a Mopar ECU, you might lose some adaptations to fuel trims, which will solve itself soon after getting on the road.

1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]