I tried to retrofit an ACC in my Passat B6 but I don't know coding for ACC.
I found 2 possibilities:

Address 13: Auto Dist. Reg
Control Module Part Number: 3C0 907 567 E
Component and/or Version: AC201 NAR 1 030 0118
Software Coding: 0020000


Address 13: Auto Dist. Reg
Control Module Part Number: 3C0 907 567 E
Component and/or Version: AC201 RDW 1 030 0118
Software Coding: 0010000

I don't know what is the difference between coding SW coding 0010000 and SW coding 0020000?

What means RDW and NAR?

Thanks in advance.