Butterfree and Venonat

Anyone more then I that has notices the similarities between Venonat and Butterfree? There's also some similarities between Metapod and Venomoth. Could this mean something? I mean, like if they originally had planned Venonat to evolve into Butterfree and Metapod into Venomoth?

Yes, I do noticed the similarity between Venonat and Butterfree. But no, I don't think that I had mistakenlt thought that Venonta evolves into Butterfree cause: 1) I watched the anime and 2) Venonat is ugly. :(

I don't see the similarity between Metapod and Venomoth, though.