表姐 means older female cousin of a different surname. If surnames are always passed down via the father that implies an elder cousin who is either your mother’s sibling’s daughter or your father’s sister’s daughter.
So what happens if, by chance, a woman in your family marries someone of the same surname? Does the 表姐 label then not apply where it otherwise would?
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Should still be the same. By the way, it's considered quite unlucky/distasteful to marry someone with the same surname.
It's still a specific relationship in chinese kinship, which is likely why it was included as apparently CNf statically encodes all possible relationships.
And, in fact, CN has never referred to Chinese - it's an ISO two letter country code abbreviation for the PRC, admittedly - but the ISO two letter language code would be ZH for the Chinese language.