The shorter front mount bolt is 60 mm vice the Crossfire at 110mm long; Mopar bolt part 6102382AA. I doubt you can run the Charger differential without also changing the cover, as the Mopar Charger cover is considerable deeper in depth (about 5/8”). You can’t get the front mounting bolt to match the car frame without swapping the cover. To run the MOPAR differential case with 3.64 gears you need to change the cover, the front mount bolt and match the flange to the Crossfire either by placing a large flange on to the Mopar differential ( preferred) or switch the rear half of the SRT6 drive shaft to a Limited.

Considering this swap on the SRT6 the preferred method would be using an SRT6 differential and putting the Mopar 3.64 gear set into the SRT6 case. You get the correct flange, and the mounting points front and rear are the same.

If you are going on to a Limited or Base using the MOPAR case/differential makes sense as the flange would match up, but you still need to swap the MOPAR cover and use the Crossfire cover so the front mount bolt and hole lineup. You would also then use the shorter 60 mm front mount bolt.