Jaw combinations

You can order also low-profile clamps where jaws are not the same type.

Most traditionally, models with self-aligning jaws (like BK-VT-B) have the serrated jaw on the other side.

For all the rest, the clamps with jaws of different jaw types are normally listed in the end of the code like -12 where 1 and 2 are the jaw types.
For example clamps BK2-VT-BT and DK2-VT-BT posses one self-aligning jaw ("B") and one jaw for addtional piece ("T")

jaw nr 2 \ jaw nr 1    D  Gn  M  (*1)  C  H  V  T  E/B
Serrated basic version R   SR DR GnR +5R CR HR VR TR B ("ER")
Smooth basic version S   S DS  GnS +5S CS HS VS TS BS
Grip jaw models D     D GnD +5D CD HD VD TD BD
Diamond coated surface Gn       Gn +5Gn CGn HGn VGn TGn BGn
Machinable jaw M         +5 CM HM VM TM BM
Cross V slot C           C HC VC TC BC
Horizontal V-slot H             H VH TH BH
Vertical V-slot V               V TV BV
Additional piece models T                 T BT
Self-aligning jaw E/B                   E

*1  :   +3 stands for machinable model in B-series