Certainly they are both disc compatible, just couldnt remember if they had the removable V mounts too, but I think they both do.
I can dig out some pictures for you tonight, however may struggle on the steerer lengths, I know they are good lengths but dont think I have actually measured them. And they are currently sat in my storage unit in Oxford (I moved house last weekend, 1/3rd of my life is in a flat in London, 1/3rd in storage at my folks in Leeds and the remainder in a storage unit in Oxford) I may be up there on sunday though so will hopefully be able to confirm.
I'll be in touch.
Oh they are both 1/18th" dia btw. And the Proclass 2 & stealths sadly didnt feature the bolt up steerers so what ever length they are, that is what they are, no option to swap it out like on the earlier forks.