Yup, these are from their North West Frontier range. I like them cos apart from some variations in the waterbottle, rifle and valise, they wore basically the same uniform and webbing from 1880s up until 1916. They can therefore be used for Sudan, Northwest Frontier and Back of Beyond (if not too fussy).
The Brigade and Copplestone Castings ones are for WW1 (up until 1916). After 1916, they changed to shorts and did away with the Kurta tunic. (More like what the Copplestone Brits are wearing.)