Good question, M. Cole, and amazing work in response by Jilliane, Anne, and others.
As to Ralph of Shropshire marrying Rebecca of Wramplingham, that does sound unlikely, until we note that Ralph studied at Cambridge (Clare Hall, now Clare College, per Tilden, p. 506). The chance to study at Cambridge is worth what was then a long trip. It's less than 60 miles from Cambridge to Wramplingham, up what's now the A11, a road that has been there since Roman times. Ralph may have met Rebecca in Cambridge, or perhaps he did some preaching in or near her hometown and they met then; that's just speculation.
Tilden provide no information about Rebecca other than her name and her death year, 1680, three years before Ralph.
Tilden notes that Ralph was a dissenting preacher (no doubt dating to his Cambridge days), says he preached frequently in New England, though never a settled minister. A glance at the vital records of Medfield--which he maintained--reveals that he married just about every couple married in that town during its first 40 years, prehaps including the marriage of his son Benjamin to Elizabeth, daughter of Samuel Bullen.
I'll be in East Anglia for a week in July, and will add Wramplingham to the itinerary.