John Walsh Senior and John Walsh Junior were the most prolific music publishers of their age and followed on from the Playford dynasty, holding an eminent position in London's music publishing industry for 70 years. Their output was so prodigious it has never been fully identified and catalogued. It's quite likely that they engaged in a lot of tune recycling and many publishers did. It was quite a cut throat business at times and content was nicked, renamed, and sometimes whole collections rebranded. It's said that there are some books that were English Country Dance tunes one year and rebranded as Irish Country Dance tunes a few years after using the same printing plates with a new frontispiece, although I've not managed to track down any examples as yet.

Tunes changed name, key, time signature, and also dance notation. Most often the name of the tune was actually the name of the dance so if a tune was adopted for a different and new dance, it would take that dances name.

When you say that Sharp and the dance manuals don't agree, is that what you mean?