Hi @adrianus, very interesting to read your learned opinion here. Regarding barbaric origin, as a non-specialist of this type, I would agree for the left one. The right one has a peculiar ROMA lettering.. I see an M upside down there and R looking strange.
Question: do you regard the shape of the attribute behind the helmet (this curl) as a distinction criterion here ? And the size of the wolf, which seems notably larger on the right one ?

Lex