I'd say that the dark SH is a kelloggi or at least a kelloggi hybrid (there have been a lot of those around out of SE Asia and Sri Lanka).
The lighter SH doesn't QUITE say "kelloggi" to me because of its rather prominant eye spine when compared to the darker SH, but the snout length (fairly short) and coronet are very close to that of a kelloggi, but from what I can tell (the pix are kinda fuzzy), it has more tail rings than the darker SH, but that could be because they show up better due to coloration. Then again, if they're hybrids, they'll be tuff to ID. At this point I'd have to go with kelloggi or MAYBE kelloggi x "?". They aren't kuda, as they lack the backswept coronet and their snouts are too short. Also, kuda lack both eye and cheek spines and are smoother in general.
The SH look young, so once they get a bit more size on them, they should be easier to ID.
HTH