RME 4350 cabinet variation question

[W3GMS]

I currently have (2) RME 4350 receivers and the cabinets on each one are different.  One has a black wrinkle finish on the front outside of the half moon dial and the other cabinet is just a dark silver gray with no wrinkle finish.  I also see those two cabinets styles for the 4350 when searching on the web.  At first I thought it may be denoting the differences between a 4350 and a 4350A however I believe the only difference on the "A" model was the xtal calibrator.  If anyone knows any more details on why and when the cabinet change was made I would appreciate knowing the details.

Thanks!

Joe, W3GMS