645 and 745 are same fit. 745’s came with wood, 645 came with plastic. OEM wood 745 stocks do not have a S&W logo on them.

The biggest confusion I tend to see when a seller is offering grips and he doesn’t truly know is that he will often mark them 59/659/645/745 grips and THAT is not correct, the double stack 9mm and .45 cal grips are not alike.