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junkrig, there are no composting heads for small craft. They're misnamed.
What you've got are "separting heads" that collect urine in one container and feces in another. You're left to haul a bucket of partly decayed fecal matter off the boat, instead of having a liquid waste tank pumped out. It's still sewage.
IF you've got enough room for two "composting" heads, you can allow the feces to actually compost for 4-8 weeks while you use the second head. Then you probably will have real compost, that you can dump in your garden. And switch back to using the other head while the second one composts.
It's not semantics, it's intentionally misleading marketing, and it is still RAW FECAL MATTER that you're dealing with. That may be more convenient to handle and dispose of than a waste tank, but it still ain't compost.