No. Externally, except for the casebacks (which are taller for 7750 movements), the cases are the same. & with the lack of manufacturing consistency between them, I do not know of a reliable way to tell other than trying the movement out in a given case. I have had V72s fit in cases made for 7750s & I have had V72s that did NOT fit in cases made for V72s. I have less experience building 7750-powered Daytonas, but, so far, never had a problem fitting a 7750 into a case made for a 7750.