Pretty likely! You can often see ones that follow the same format in the same hand, but with different names subbed in. Presumably some people went to a specialist who then followed mostly the same format varying for your own needs (a bit like a lawyer today?). It's unclear what the proportion was, maybe there were lots of people who figured DIY was good enough.
I was just writing about these when I saw your comment.
The museum at the Roman Baths has some of these on display. If you visit Bath and are interested in history* then the Baths are well worth a visit. The whole site is rather larger than it appears on the surface.
* Tbh, if you are are not interested in history (or architecture) you are probably not visiting Bath.