I am in the process of a build using this cartridge, and I have done a bit of research, but bear in mind that my answers may need verification by a true expert.
Yes, the .284 go gage is correct.
No difference in dies and brass, altho my box of Lapua states "Norma".
The difference between the Win. and Norma is in the chamber, the Norma having a longer throat to allow long bullets with high BCs to be seated farther out, therefor increasing powder capacity, at the expense of having to use a long action. Or single feed with the SA.
Norma filed the paper work and made their version a standard factory cartridge.
If you insist on a short action with a magazine, a .260 Rem may be a better choice.
The long Norma is making this a popular round, and is the one to get IMHO.
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