In breast sizes... Is a 30 C smaller than a 36 A?

i've never measured before. just found out how on gag today. but now im wondering how anyone knows what anyone is talking about bc if you say you are an A pr B or C but you happen to be really small or really big around your ribs. then the actual difference makes for hmm.. vm. i see. the inches jut out. so even if you are really big around your rib cage, does not change the actual size of breasts much... I guess?

HELP:)
Updates
+1 y
OK so 30 / C can be in some cases be = to 32 / B.

Correct?
In breast sizes... Is a 30 C smaller than a 36 A?
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