I agree it is a bit confusing, and I made the same assumption that you did.Well they could have simply mention that instead of just the girl name :/
how i msuppoe to know that maya + maya + maya + max = max with any girl that use maya bones , when on the same list there is some maya + max, tali + max etc.
why not just go like
girl type A + boy type A
girl type B + boy type A
etc.
instead of saying girl name wich make thing confusing -_-
But to be fair, in the scenes list, on the top right corner is a list of "shared animations"