I agree that the marriage refers to Huldah Estabrook, daughter of Abraham. Since Huldah temple, wife of Samuel Estabrook married in Concord, they both could have been of Concord, but there's ten years difference between them, and the age on the headstone matches Huldah Estabrook.
There's a settlement for the estate of Abraham Estabrook dated 1756 which is signed by Huldah Estabrook, meaning she was alive and unmarried not too long before the marriage date. As far as the different marriage dates, these apply to one marriage (first is the published intention to marry, and the second is the actual marriage).