I have no personal experience with Silkies.
But I have seen quite a few single combs, and some combs that were pea, rose, walnut, V, and buttercup (all on non-Silkies).
That comb doesn't look quite like anything I have seen before, but it resembles a single comb more than it resembles anything...
The second one looks like it may have a single comb, which is not right for a Silkie.
The comb type will become more obvious as it grows (and then we will see whether I am right or wrong :D )