If it's a marine battery, it has a large post and a threaded post ... so you could connect one light's leads to the large posts with clips & the other light's leads to the threaded posts.
While the LED lights probably don't draw much amperage, I still don't like the idea of one set of clips attached to another set of clips. And to avoid any possibility of sparks (around the gas tank or batteries) I attach the Positive leads first & then the Negative leads.
If something is going to arc it will regardless of the order of connecting the wires