There is. Sealioning is when you know damn well your position is wrong or otherwise odious, but rather than confront that point (or come right out and say it) you instead pester the other party incessantly to support every single little claim they make with the usually unspoken implication that everyone should think those claims are false.

The difference is that individuals engaging in Sealioning are not doing so in good faith, and the acid test comes about pretty quickly they they don't address or digest any of the points you've supported with evidence/sources and instead move the goalposts immediately and pivot to quibbling about something else and demanding a source for that, instead.

Another Sealioning trick is to fixate on something you said or take it out of context, build a straw man of your argument, and demand evidence/sources for the argument you did not technically make -- ideally, a straw man argument that is deliberately unsupportable, or is attacking a matter of your opinion and not a fact but treating it as if it should be supported by citations and evidence. E.g., I don't like Metallica because I think Lars Ulrich is a douchebag. Sealion: "Excuse me, but can you provide a source attesting to Lars Ulruch personally being a douchebag to you?" No, I just don't like him because he rubs me the wrong way plus the whole Napster thing back in the day. "Well, since you have not addressed my polite request for a source attesting to Lars Ulrich personally being a douche to you, [ignoring the supportable claim about the Napster thing] your opinion about not like Metallica is obviously laughably absurd [and therefore you are deserving of the ridicule and inserts I am about to heap on you, or will direct others to make at you]." Etc.