Do you have evidence that they're the same? Because personally, they're no way the same in detail, or how they look like. If you want to say that two thing's look the same, it's best to have proof to back it up.
I don't think they look anything alike. The OoT moon is a normal looking moon, regular shaped, regular colored. The MM moon is a messed up, lunky, dark brown mess with a scary face on it.