Identifying shoulder board

Hi, i have this photo of two brothers, one in the Waffen-ss and the other in the Heer.

The heer one has a gothic letter and a number on the shoulder board. I think the letter is the "B" and the number 33. They have a colour different from white, but the waffenfarbe on the feldmutze is clearly in white colour. Someboy has any explanation of this?

Any info will be appreciated, thanks.

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