You are being the serious rivet counter here !
There was more overlap in these things than you suggest, this has been discussed on various Norton forums, bikes keep turning up with non-catalog equip but which match the factory records,
so Nortons evidently used whatever was to hand sometimes to turn out bikes for sale.
The dolls head box lingered for the 500T and manx for example, for some years too, so were stocked for years after most folks say they were gone...
And, strictly speaking, approx 95% (?) of '1946' model Nortons are ex-WD bikes,
since this was the year of 1st registration, and refurbed ex-military bikes were swamping the market. (military bikes weren't registered, but they did have to have a military number).
Never mind that they were manufactured during the war years.
And yes, the dolls head box was suggested here precisely because his bike looked to be an ex-military bike, without this having been confirmed yet.
Makes finding a suitable box fairly straightforward.
Actually helping folks is what these forums are all about...