If both were "of this parish" there's every chance that this was a different William SPRIGGS.
The people I'm researching might well have married in Ireland, since the 4th Dragoons were an Irish regiment.
Their daughter became a convict, and used a number of aliases, including SMITH, so folk have thought this marriage might explain why she chose that name.
I was just hoping to either scotch that notion, to validate it

Her other aliases have an understandable connection to people she knew.
Who knows, maybe she just figured SMITH was a good anonymous name to use.
Thanks for taking the time.