It’s pretty simple, but if not yes you can ask your tuner to do it.
As it’s a VE based ECU, technically you can just update the injector size in the calibration to the CC of the RX8 ones, however I would still wait to fit them until you’re at the dyno.
You can download basemaps, last time I checked the firing order, engine cc and stock injector cc was wrong amongst other things so I wouldn’t assume it’s a complete good to go calibration.
If its TD04 under fuel cut, you could drive to your tuner on stock ecu, then fit the ME there when on the dyno and do it all in one go.