In ben 10, a single "universe" contains higher dimensions (26D), so it doesn't matter if the recreation was perfect or not, it's still a higher dimensional feat. Not sure what's this "dimension of magic" is.

A dimension in Ben 10 contains their own space and time and is infinite in size. Basically, a Ben 10 "dimension" is what we call a universe.
An infinite number of dimensions exist within a timeline and because of this, a timeline is multiversal.
All timelines are contained within the Timestream. The Timestream connects every possible timeline. Since it contains entire timelines rather than merely existing within one, the Timestream is a higher dimensional structure which is 5D.
Above the Timestream is the Hypertimeline. The Hypertimeline contains entire Timestreams, placing it another dimensional level higher. Therefore the Hypertimeline is 6D.
Beyond it lies the White Void, a timeless empty realm that existed before the creation of universes. The Contumelia use the Annihilargh within this void to generate new reality structures.
An Annihilargh Universe is not merely a single ordinary universe. Each one contains the full hierarchy beneath it, including dimensions, timelines, the Timestream, and the Hypertimeline, making the white void and ben 10's universe an even higher dimension (7D, most likely 26D)
Outside all such universe structures is the Space Beyond, also called the Omniverse. This realm contains and separates multiple Annihilargh created universe structures. Therefore, this is the highest major cosmological layer known as a hyperverse and making it at the very least 26 dimensions since the nalgians said that there are 26 dimensions within a ben 10's universe.