Of course, change did not happen overnight, but pondering the transition is interesting. For example, look at the figures below, which are smaller-scale look-alikes of the "Sherratt" family above. Did "Sherratt" make them? Because these figures do not exhibit a single "Sherratt" attribute, I would say not....but "Sherratt' continued into the 1840s, so it is possible that this pot bank copied or adapted existing molds to meet economic imperatives and consumer tastes.
I have seen several other instances of "Sherratt" adaptations where recognizable "Sherratt" attributes remain, such as in the Grecian Daughter groups alongside. So, while I would not bet money on the little family groups also being "Sherratt," I just can't rule out that possibility.