I'm searching for a replacement climate control unit for my 92 400se. I located a used one but the vin # is for A074423 -

My question is...

Does anyone know what the difference is between the
VINs
-A-074422
A074423-

Is the latter one only for activated charcoal filter only?

Are the units interchangable?

Attached Thumbnails

 

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML