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The controllers should be the same GPEC2A but the OS is different...for example a 2015 challenger RT runs 68228440AC whereas a 2015 charger RT runs 68228422AD. If you compare the stock tunes there are slight differences between the two.
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2015 Challenger RT+ M6 (non-STP)
8lb Magnuson w/ Innovate PSB-1 wideband/boost/shift light gauge
Corsa extreme (2.5")
4" Aluminum one-piece driveshaft
Hellcat bottom airbox
Stainless Works LT headers (2" primaries)
Barton shifter assembly w/ Lou's short shaft and Speed Dawg knob
Comp Cam 7929 & 7748 push rods (gives slightly more lifter preload)
A2speed aluminum coil and valve covers (built in catchcan)