There is. The Gibson/Epiphone mini humbucker has one blade magnet coil, and one coil with a magnet underneath and screw pole pieces.
The Gibson Firebird pickup has two blade magnet pole pieces under a solid (no holes in it) cover . The blade magnets give a tighter magnetic field than the bar magnet + screw pole pieces, which gives a sound that's closer to a single coil than the mini-humbucker, despite the two coils being the same distance apart in both pickup types.
If it's this incarnation of Old Black:
Then the Alnico V Artec will be the closest you'll get at low cost.
There isn't a whole lot of sound difference really between potted and unpotted pickups, except that unpotted pickups are prone to microphonics. Given the amount off gain and volume that Neil uses, there's a good chance that the pickup may have been potted at some point if it became microphonic. Microphonic feedback is just an uncontrollable non-musical high-pitched howl, so really not desirable at all. From demos on YouTube, I've seen, you'd need to play very cleanly to hear the slight difference in detail that an unpotted pickup will give. But Neil Young and clean?
If you really want to get close to the exact sound, then you really do need to go down the expensive route, say a SD Antiquity II.
And of course you'll need to get a '50s gold top and then paint it black.
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