Not exactly. Top dining experiences are just called 'signature' by Disney to refer to the ambience or food, it doesn't relate to the dining plan at all. It just so happens that some of the restaurants accept the plan at different levels, and some don't.
i.e. Victoria and Alberts is a signature restaurant, but the only dining plan you can use there is platinum
Shulas is also signature, but doesn't accept any plan
So don't relate the level of the plan to where you can necessarily eat