The Me P.1101 design came after the Me.262 and the P.1101 was never completed and flown (although it served as the design basis for the later Bell X-5)
I don't know how accurate it is or whether they flew or not but I've seen several references like this.
The result was a crash program to introduce new swept wing designs, both for fighters as well as bombers. A prototype test aircraft, the Messerschmitt P.1101, was built in order to research the tradeoffs of the design and develop general rules about what angle of sweep to use. None of the designs were ready for use by the time the war ended, but the P.1101 was captured by US forces and returned to the United States, where two additional copies with US built engines carried on the research as the Bell X-5.
Some interesting info on this site.
http://www.fact-index.com/s/sw/swept_wing.htmlThe Me 262 is generally regarded as the first swept-wing jet fighter to be used operationally. This is not surprising as I believe it was the first operational jet of any type.