The square-sterned clipper kit with a metal deck is probably the Marx Sea Witch. The same ship was also produced by Aurora in around 1/96 scale; this is all-plastic and has a detailed hull, so may not be from the same moulds. Lindberg have recently reissued a 1/96 Sea Witch; not having seen inside the box, I don't know whether it's the Marx or Aurora kit (assuming they're different!) It definitely has a plastic, not metal, deck.
Here's a link to some photos of the Marx kit: http://www.rubylane.com/shops/charmingandcheap/item/8316
As for the one with guns, I have no idea! Anyone know if Marx produced any subjects other than Sea Witch (not counting the "Swordfish" reissue of the latter)?
Is there any possibility you could post photos of these kits? Even if there are no boxes or instructions, someone might be able to identify the ship