Any real difference between factory 340 and 360 connecting rods?

I can weight a set of speedmaster for you tomorrow....generally stock 340/360 rods weight around 745 gram....I believe the Speedmaster are 680 gram...the lightest H beams I have seen is 630 grams...but have not seen those for sale lately...

I got one set of H beams that are 745 grams....dont remember where those came from