Impossible to be 100% certain but if you search for both on family search.org it looks like Zacharias' parents were "Thomas & Jenny", and Samuel's were "Thomas & Jane".
It's possible that Jane and Jenny are variants of the same person's name, If so, then they were brothers.
The two baptisms were in different parishes (Frittenden and Cranbrook), with others for the same (perhaps) parents in Biddenden, but all three places are close, so that's entirely possible.
BUT without further documentary evidence this can all only be described as speculative, or circumstantial proof.