Board Thread:Versus Debates/@comment-44916514-20200123204114/@comment-34656247-20200208202138

Squinty97 wrote: It doesn't need the exact design, and that's already been proven. There is no precedent for the mangekyou sharingan, just sharingan...

Their Sharingan have identifying features beyond just the visible outward design. And sealed jutsu can be coded to react only to certain Sharingan. The chakra color apparently, but this is only noticeable by the byakugan....Sealed jutsu can be set to activate to specific target, could be anything even to a specific time as in madara's case.

If it's the case with Sharingan, it's easily the case with Mangekyo, since we know all Sharingan look the same. Visually speaking, they don't.