The pair I had in my shop were a 110/44 so quite a bit bigger. I am surprised it was over 50 grams lighter in the smaller size though. Goes to show that the layup day by day can probably change and drastically change the weight as well.

I just put on a Zipp SL bar 42cm and aluminum Ritchey stem 110mm combo for a customer and it weighed in at a stunning 286 grams!!!!

Good luck with the new bar and stem. They should really bling up the bike!