Today we have hundred of print format styles to choose from.
Certainly in the time that we learned “joined up writing” as a youngster the Teach at that time told us of the Writing Style that it was called. There was not one Style being taught in Schools but many different ones that were in use by the Education Authorities at that time.
My Father’s writing Style was taught in a Lancastrian school, my Maternal Grandparents were from Yorkshire and Cheshire and all three were very different.
What I am leading up to is that the Style of your signatures are all very scimitar and to me would indicate that the hands that created the signatures were taught their writing style within a geographical region.
BIB, that does sound interesting, and may be handy for those researching elusive ancestors who we knew could write as we have the signing marriage certs or witnessing them etc.
As for Rebecca Claire's Wm Wyatt, I would probably keep in mind that the signatures you posted may be from different people, especially as Wyatt is a common name. There are similarities but some subtle differences.
If you could give dates and locations of the Wm Wyatt's we may be able to help further.