DarZeelon. I got out my calipers and drew both con rods side by side in cad.
I already know that the the pin bosses are the the same size;

6 mm for piston pin boss
and
6.5 mm for the crank pin boss

It turns out that the SF/RF/Hanno con rod is 42mm on center.
The FSR/SFN con rod is 40mm on center.

This could be good news for rainedave as it would make up 2 mm of space. The only missing part of the equation is the exact measurement between the the top of the SX piston pin boss and the top of the piston.

My FSR/SFN piston measures 7.3 mm between the top of the pin boss and the top of the piston. The SX piston would have to be 5.3 mm to for the SF/RF/Hanno rod to work, if my theory is right. What do you think?