MAF Scaling Adjustment Needed After Block Swap?

I swapped a 2.5L engine block and heads from a 2012 Forester into a 2014 Crosstrek, which originally came with a 2.0L. In the process, I also swapped the larger fuel injectors from the Forester in as well. I'm still using the Crosstrek ECU, and my initial trims are quite negative. My question is, does the increased displacement lead to the MAF scaling needing to be recalibrated? I did not swap the MAF or the intake, and it looks like both cars use the same MAF, but of course the larger engine is drawing in more air. My original thinking was that the MAF sensor would be able to tell that there is more air flowing so there wouldn't be any adjusting necessary. I do still have the original injectors, so I can definitely swap them back in to adjust the MAF scaling if needed, though.

Tuning with ECUflash and RomRaider. Thanks in advance!

MAF is only an issue if the intake track from the MAF to the cylinder is different in terms of restrictions flows etc. So likely this effect is minimal assuming your using the same MAF

Injector scaling will be your first problem. This has a decent impact on the tune. So that needs fixing.

This can be a bit of trial and error to get right in a factory ECU.

Second will be the fuel maps. below around 4000rpm ish and below around 50% throttle it will be in closed loop mode meaning it will self correct over time. Above this it goes into open loop. Meaning the O2 sensor isn't doing much for the tune and instead is there more for engine protection.

So you'll need to likely retune your fuel tables above this.

From experience at putting a 2.5L into a 2L ECU'd WRX you'll never get a like factory experience without spending a long long time fiddling with the tune.

Thank you Paul, that's what I thought but I was beginning to doubt it. So you would not recommend putting the 2.0L injectors in, correcting the MAF scaling, and then switching back to the 2.5L injectors? Sounds like that's probably not necessary or beneficial and I should just focus on adjusting my fuel tables for the larger injectors, right? This would make sense given the large negative trim values I have; the car thinks it has smaller injectors so it's dumping in too much fuel and then adjusting down to correct for the rich mixture.