I just purchased a 2021 LV1 GEN V 4.3L V6 with 8L90E complete with harness ECM and TCM to swap into my 87 Buick T-Type. This is a E90/T93 set up. Question is has someone successfully used an older ECM/TCM (E92/T87) to control a newer set up like this? Engine control is not as big as a concern (cause I think harness and most sensors will transfer over) the bigger concern is will the 8L90E work with the older T87/T87a TCM? The connector on the T93 looks the same as the older TCMs but not sure about the pinout ?..Any info would be greatly appreciated?..👍