Not really because Mythic Zoans so far, with the possible exception of the Buddha one, come with abilities on top of the Zoan stuff that are akin to having another Paramecia or even Logia type of fruit.
Marco for example has fire powers, healing fire powers and also has the various forms he uses. His fire stuff is seemingly not as flexible as the fruit Ace/Sabo used/uses but they also can't heal with their flames. Kaido has various Zoan forms but also can control the weather and make things fly because that's dragon stuff in setting and in certain real world mythology. An argument can be made that those are not technically separate powers but just things the mythological entity has in the One Piece setting but that argument does not stop Luffy's fruit also making him electric proof.
Edit - or to rephrase it Mythic Zoans be bullshit!