Many snow bengal babies look just like your kittens. In fact the "snow" variety of the bengal arose from breeding bengals (or earlier generation hybrids) with siamese cats. The pattern you are describing is called 'marbled/classic tabby' by the way, and it is not rare.
A friend of mine has some cats, whose mom is a traditional siamese, with this same pattern, namely, the tabby AND defined points. One of the boys also happens to weigh in at 20 pounds (not fat, just a very big cat), which make the 6 pounder mom look like a kitten.
I actually have seen calico cats that happen to have points (so one of the parents was a siamese/siamese point carrying). They look really funny with all the colors mixed in both solid and tabby patterns throughout the fur.



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Bob Daisy Emily