Chris,
did You meant dog-tags (EKM = Erkennungsmarke)?
And if: As far as i know the German dog-tags weared individual digits, such as date of entry to military duty etc. with no specific troop codes.
Due to avoid mistakings - i believe - because of common troop-transfers/-changings to happen, there was no special unit-code applied on them.
If i am wrong at all or misunderstanding Your entry: Sorry!
y/f
Norbert