I don't know the age of these, which might have some bearing on your query.
I do know that the forms of cutting can change over the years within companies - Edinburgh certainly. I've been paying attention to the quality of cutting on their flagship Thistle decor, and it is not nearly the same quality now as it used to be. There is significant loss of detail, not nearly so much work put into each piece. Profit deemed more important than quality, again.
Cuts sometimes have to be adjusted to fit the vessel they're on better too.
All together, I wouldn't rule them out as being right. If the quality is there, a few details difference should not
neccessarily indicate anything odd.
I am more concerned about the number of cuts in the base than I am about 3 vs 5 flowery bits. The number of base cuts do tend to be consistent in Edinburgh. I don't know about Stuart.