The only difference between the OPUS BT-C3100 v2.2 and the OPUS BT-C3400 is the model number.
The BT-C3400 was “badged” for a particular dealer.
I remember reading this quite a while back here.
THIS is the only difference between the BT-C3100 v2.1 & BT-C3100 v2.2 / BT-C3400