The Old Glory Pathans are reasonably good for the most part. Probably amongst the best of OG's entire catalogue, much of which is, um.. an acquired taste.
I've just bought some of Michael Perry's new Pathans - they are gorgeous: essentially a full retread of the Afghan Tribesmen he did for Foundry, what, 20 years ago? Those remain some of the best figures, anywhere, ever, IMHO, and he's basically just doubled the available range - the new ones being a whisker bigger, but not so's you'd notice.
In my NW Frontier collection I'd previously used the Foundry Afghans and some Sikhs, alongside the Foundry Darkest Africa Baluchis. Yes, being Copplestone, they are fractionally larger, especially the 'character' figures, but again, not to an appreciable degree - and I'm fussy about these things.
What I'm not fussy about is pinpoint historical accuracy in the question of the correct webbing for 1887 vs 1897 etc.
British infantry in khaki with breech-loading rifles are British infantry in khaki with breech-loading rifles from more than 6 inches away. So I'd go for the Perry plastic set which are a/ superb b/ cheap. But that's just me. I do appreciate there are more fastidious people who like their toy soldiers to be 'right'.
The original Foundry British colonial figures are definitely on the slight side. More so than the Afghans.