69 Dart Rear End Swap - Looking at Ford 8.8

Benjamin Thomas Powell said
pull out a tape measure and check it on the pulled one and stock diff. That will give you the guaranteed correct answer. It’s also easiest since you have both in hand

UPDATE: here’s the two rear ends side by side. From what it measure it’s off by about 1” towards the passenger side. Hoping I can offset the motor and trans a bit to compensate. If anyone else has any ideas or insight please share. Thanks.