That's pretty close to Ric's first picture.
A couple of things to look at though. Jeff's latest picture has a seam line forward of the fairing that, although hard to see through the paint, might be a line of flat head, flush-mounted machine screws. I don't see a similar line on the Hellcat tank.
I'm also looking at the curve of the fairing as it sweeps up to the point where the flange attaches to the belly of the aircraft. In Ric's first picture that curve seems very pronounced, almost U-shaped, although less so in my Hellcat pictures. (Wish I could rotate Ric's picture 45 degrees clockwise!). The curve of the fairing on the Zero tank seems to be more flat.
Absent a side-by-side hands-on inspection I don't know we'll be able to determine which aircraft the tank came from. They're too similar. In the end though it doesn't really matter if it came from a Zero or a Hellcat. We can definitively say it did not come from AE's Electra and that's what really matters.
A fun exercise though!
Got another project Ric?