Does anybody have an idea on how to identify a NAG1 transmission?

Most of them have a barcode on the driver side, but I cannot find any information on identifying them.

I know the NAG1 is also called 722.6 / a5w580, but there seems to be a difference between the Mercedes and Chrysler transmission. Trans code for Chrysler is DGJ. There seems to be a diffence between transmission and the last two digits after 722.6XX can give clearance. However I cannot find any number on the transmission itself besides the barcode on the driver side.