Did Fender use the same bodys for the Strat plus and Ultra? Thanks

No - Strat Pluses were regular alder bodies for the most part. Strat Plus Deluxes were also alder at first, but when they changed them to have the blue/silver/red logo Lace set they also added ash veneers to the front and back of the alder bodies. The excpetions would be the natural (i.e. clear) finish guitars as they were solid ash. The Ultras had figured maple veneers on the front and back of the alder bodies.

Of course the shape of the bodies, contours and routing were all the same.

The last Pluses which came out from the factory in 1998/99 featured an HSH rout. Same thing for the Jeff Beck Strats from that era.

Fender went to non-veneered alder and ash for the bodies when the first American Deluxes came into the scene.