Stainless seizing into alloy is dissimilar corrosion, in non-marine applications use copperslip to prevent this.
Stainless seizing into stainless is galling or "pickup", likewise in non-marine applications use Copperslip.
In marine applications it gets a bit fuzzy, there's a school of thought that says copperslip is ok, another says that is exacerbates electrolytic corrosion (big word day today
) I have a nickel based anti-seize that's approved for seawater applications on nuclear installations, so I reckon it will do for my bote
Failing that I'd use a marine grease such as the thick blue grease that Evinrude sell, can't remember it's name off hand, good stuff though