Just wondering if they did. Or are they longer than the NC30's?

Yep, they will fit. They are longer so will stick out the top of the yokes a fair bit (about 30 mm?). They also take different brake calipers. You can fit the shorter NC30 stanchions to the NC29 forks, but then you're stuck with the NC29 brakes (or vice versa).

Hmmm...

What are they like compared to the NC30 later forks? I gather there 41mm showa, are they the same construction, i'm thinking these NC30 forks might throw the geomatary off a bit on my NC24.