Just occurred to me.
It is likely that in the process of uplifting, the uplifting species
It is likely that in the process of uplifting, the uplifting speciesis bound to pass on to the uplifted species many of its own traits. If there is more than one way to do a thing (and there often is) then it is likely that the uplifter would redesign the upliftee's mental architecture (where their own wasn't sufficiently advanced) in the image of their own. The exceptions to this would be when it is easier to use a different way then how the uplifter is constructed either due to having discovered a simpler way than what evolved initially or due to compatibility problems with the upliftee's mental architecture.
Looked at this way, uplifting could be considered a sort of reproduction between the uplifted and uplifting species.