No, they are the same as the other TFA hero saber (Finn's saber):
The numbers are slightly different than in this image: length grip: 88mm, cut notch: 7.0mm wide and 14.0mm distance from edges. The rivet head diameter is 5.6mm.
Bumping this because I'm doing a TFA/TLJ conversion – the grips touch the bottom the the can, right? If so, how does the 3.5mm gap between the grips and the clamp work?
3-cell bottom: 92 mm (the 2 Roman's and 1 vintage bottoms I have actually stick out 92.5mm when pushed all the way in)
Grips: 88mm
Which leaves a 4mm gap. (4.5mm, in the case of my flash, which looks absolutely enormous.)