How different is NASAMS III?
NASAMS III will be a high mobility variant akin to the Tor missile system. Current NASAMS II high mobility variants must stop, stabilize, acquire and launch, so in that respect they're analogous to the standard Russian Pantsir-S1.
NASAMS III will be able to acquire and launch without needing to stabilize the chassis or stop movement, so it's more like the Tor or Arctic Pantsir.
Visually, NASAMS III should resemble the AVC-30 mounted Hisar-A, though I don't believe that the Hisar-A missile system is capable of firing while on the move.
What components are Norwegian?
The FSC, architecture and some supporting elements such as radio links. But that's not exactly what I mean when I said it was a Norwegian project. Being a collaboration with Raytheon (though initiated by Kongsberg), Kongsberg generates royalties from any sales of NASAMS and given it was a Norwegian program, and still is, that's what I mean when I say it's a Norwegian project.
Think of it in the same way you would of our Nansen class frigates. Spanish hulls, that were themselves derived from the American Burke series, American radars and illuminators and missile FCS, missiles too, Italian guns, British torpedoes and sonar, Norwegian architecture, ASW control systems and anti-ship missiles, American engines... but still a Norwegian program and if sold, would generate revenue for Norwegian ship builders, despite them needing to source products from other nations.
Equally you could say the same with the Gripen or even India's Tejas, both of which, despite being national programs, are festooned with foreign kit.
@Kvasir I'm most interested in radar and how its different from Akash SR-SAM or what mk-2 won't provide.
Regrettably I know squat about Akash, so I wouldn't be able to do a comparison.