I am not sure you can take this to the bank, but..... look at the scrolls with lions heads in Prudhoe Chare and compare to this blow up from a photo of the Town hall. This is a door on the Eastern side.
I m not 100% sure but they look identical.
There are also what appear to be some bearded faces in above the windows on the second floor [southern edge, between the corinthian columns]. They look like the ones in the Chare.
Actually as an aside have't they got the column order wrong; thought it was meant to be; doric, ionic, corinthian, composite etc.
This might be a wild goose chase, but was the town hall built in 1881 ?
Have lightened the Old Town Hall photo up a bit, and I think you are right!