No, not all B cups (or A cups or C cups, etc) are the same size. In fact, the cup size of a 36A bra is relatively similar to the cup size of a 34 B bra, and the cup size of a 38 B bra is relatively the same as a 36 C bra, and so on. It is important when trying on bras to experiment not just with which band size fits you the best, but also which cup size as well. Just because you have been an “A cup” your entire life (since puberty) does not mean that you are not a B cup now.
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