Where do you get from the information about the Austrian canister? For me at least according to Demian it seems to be similiar to the French.
Otherwise the question still remains.
The old construction of canister in the French Army was observed to be inferior - or better BELIEVED to be inferior (see De Scheel ) that those of the enemy.
The new canister got new ammunition (balles de fer battu) and the new "shell" - or to speak in terms - nouvelles cartouches - those increased the performance of the canister considerable.
So both must have had an effect on the performance, I will look into De Scheel on this.