I did a bit more digging and it looks like both your great-grandmothers descend from Jonathan and Cynthia (Waters) Crandall. One comes from Worthy and Sally (Blackmer) Crandall and the other from Russell and Mary Crandall. Russell and Worthy were brothers. It looks like your ladies were second cousins, since Worthy and Russell were brothers. Ellen was the d/o Charles Crandall and granddaughter of Worthy. Florence was the daughter of Waters and grand daughter of Russell.