Thanks for all your replies, I find it difficult to identify the Nepalese birds of prey from my little identification book. I photographed them near to Pisang on the Annapurna circuit, they gathered over us as we were eating lunch
The 'Grimskipp' field guide to birds of the Indian Sub-continent says of HGV "Larger than Eurasian Griffon with broader body and slightly longer tail. Wing-coverts and body pale buffish-white, contrasting strongly with dark flight feathers and tail; underparts lack pronounced streaking;". This tends to confirm that the second bird is a Himalayan Griffon, with the bird in the other photos being a Eurasian.
That description is valid only for adult birds (picture 2 in the first post), and doesn't really confirm anything regarding subadults. Juveniles and subadults look completely different than adults, for example here's a juvenile: