Historically, St Michael's Mount was a Cornish counterpart of Mont Saint-Michel in Normandy, France (with which it shares the same tidal island characteristics and the same conical shape, in spite of being much smaller, at 57 acres, than Mont St Michel which covers 247 acres), when it was given to the Benedictine religious order of Mont Saint-Michel by Edward the Confessor in the 11th century.

Can we conclude that are mont st michel and st michael's mount related?
yes