Yes, the show has a similar setup to Hotel del Luna (2019) from just the year prior. Yes, you should compare them. In fact, I've already done the same.

TL;DR = Spiritual Female Lead paying for her sins. Supported by her group of assistants, including a freshly recruited human Male Lead. Forced to help others before they themselves are able to move on and reincarnate. Episodic in nature with the underlying reincarnation plot slowly creeping up towards the end. Cue funny bits, cue emotional bits. End.

What Mystic Pop-up Bar does different is deciding to stay relatively simple compared to it's older sister. The comedy bits are a bit more grounded. The emotional bits don't quite hit the same. The episodic stories are less compelling. The main plot line is a little less emotionally complicated.

On paper, the show should be fine. Fun visuals, decent cast, and a plot that should be simple enough to pull off without any major hiccups. And for the most part, it does. But as I've selfishly stated earlier, I am directing comparing this to Hotel del Luna so everything in my review so far means jack squat to me.

Though the stakes are different when deciding which establishment to patronize, I'd rather visit Hotel del Luna than the Mystic Pop-up Bar.