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Did you buy the boat in Europe?
I'd check with a CNG filling station to see if those fittings will work with a US CNG refill, and if they do, see if the gas burns acceptably well. Or, they may be able to change the fittings. This is not just a matter of screwing in fittings, they are limited by law regarding tank marking, pressure ratings, and fittings so conversions may be problematic.
There are a lot of PITA rules about gas tanks and fittings, but they are there because folks cleverly manage to blow themselves up every year, I can't argue in favor of common sense when the "booms" are so big.
In most of the US CNG is relatively hard to find, even though it is safer than propane (it floats out of the boat instead of pooling in the bilge) so consider that as you look at your options. A stove will usually work with the "wrong" burners and jets--it just won't work well. It is worthwhile making your system all "correct".