The various improvements to the F4U-1 were the bubble canopy, the center rack, and the -8W engine. Those improvements were gradually "standardised" to the point where giving it the "A" designation came along to differentiate it from the earlier configurations. The upgrades did not all happen at once, and many a/c had some but not the other improvements.
So the F4U-1 with the -8W would represent either later models of that version, or older models that had the engine swapped out from an -8 to a -8W.
The "birdcage" F4U-1 soldiered on well into 1944.
So I think its "correct" to have it with either.