Forever curious?

I use both of these glasses - BUT -  not, as a rule, for the same liquid(s).  Today, purely out of idle curiosity and, maybe, a touch of thirst, I felt inspired to test the capacity of both.
(275ml B. T. W.)
NOT much to pick on between them is there?
B. T. W. 
NO liquids were harmed during the making of this shot.

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Just for my record - 8 weeks - by the date.

;¬)