So looks like the "extra" sockets tend to run a couple tenths of a mm. bigger at the work end or a tiny bit more? (not thinner) looks like drive end might be up to 1.1 mm bigger on the 19 mm. sockets
for the 1/4" and 3/8" drive non impact but none for the 1/2" drive-
lets look,a YFSMS191 A=25.4,,,,,FSMS19 A=25.1 (in mm.) 19mm. sockets (common size but I would prefer 19 mm. in 1/2" drive mostly,,,looks like they only have "extra"s in 6 point no 12 point