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If you want the true original look, the Moss spray paint is the best way to go, at least that I know of.
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If you mean the factory paint quality had runs, holidays, overspray, orange peel or whatever you can 'replicate' that with a spray gun or spray can if you really wanted to. The Healey concours opinion is that the quality should not match a bad day at the factory (runs, overspray, etc.) but should match the quality of the specially prepped cars used for auto shows.
I doubt that anyone can tell the difference of a motor painted with Hirsh or Moss paints (unless there is a shade difference) because you can get good or bad results with both and they are both enamels. In fact, Hirsh offers their paint in spray cans and wouldn't be surprised if they package it for Moss.
Cheers,
John