I've been wondering this for quite a while. I've had a (repainted) NECA Freddy VS Jason mask for over a decade and it always seemed a little small to when I compare with photos of the movie mask.
Josh Ludemann of Beyond Disgusting Studios, often the first mask maker out of the gate with a new movie mold piece, recently pulled a limited run of 20 pieces from the original Freddy VS Jason mask mold, won by Sean Clark at the Bill Terezakis estate auction a few months ago. I've got number five.
Finally, I can compare the NECA to the real thing. What I found is that while there are some obvious differences -- the NECA's nose and overall profile is slightly flattened compared to the movie mold piece, the forehead has been reshaped and about 4 mm of the edge has been trimmed off -- overall, it's about as faithful to the movie mask as I expected, given previous NECA mask experiences. Slightly wider, slightly shorter. Noticeably smaller and flatter, but with the details faithfully preserved.
Profile flattening is sometimes the result of molding a piece without creating a plaster shell to hold the shape of the silicone, or several generations of recasting. In this case I think it's probably the former, but it's hard to say. NECAs website advertised their VS mask as cast directly from a film-worn mask, though which one it was isn't clear.
For anyone interested in exact dimensions, the NECA is 23 cm height x 19.2 cm width measured across the back; the movie mold mask is 23.4 cm height x 18.9 cm width. It's closer in actual dimensions than it looks in photos, but a few millimeters of lost plastic makes a lot of difference when you look at it. For comparison, the end scene mask formerly owned by Mario Kirner measures 24.5 cm x 17 cm, according to the Propstore auction.
Now that I finally have a direct movie mold VS mask, the NECA will be up for sale, probably on eBay. Keep an eye out for it if you're interested.
