It's probably worth reading the original story
here, which says this:
"ADDENDUM: Sadly, although Carr was a heroic fighter pilot, it was later discovered that the story above was a fabrication when Carr himself admitted several times that most of the exciting parts of this story were a work of fiction. Carr was not shot down and on the run when he came upon the FW -- it was a planned transfer of a captured FW 190 from Linz AD, which was already occupied by the British. The event occurred on May 8th, after combat operations had already halted. It was nothing more than a massive embellishment."
FP.