I compared WNBA viewership to NBA viewership overseas following the draft of an international player who previously played on their country's national team. Direct, apples to apples comparison.That's because not thinking one-dimensionally like your original assertion.
There's a slew of reasons why the UFC and the WNBA would have completely different viewership numbers.
Do we need to get into why mens sports in general has a larger audience than the women?
Audience size is irrelevant for boost in viewership (though, actually, a smaller audience like the WNBA should more easily show a % increase).