I bought these two coins from a lot, and I’m almost sure they are from Gallia Belgica, but possibly from different issuers.
The coin on the left measures 17–18 mm, and the one on the right measures 14–17 mm.
I believe the larger one is this one: N#76247
At first, I thought the smaller coin was the same, but since it's identification wasn’t listed in the comments, I looked into other issuers and found this one: N#323084

