When observed by a different conscious being, yes. But from the inside observed by oneself, it feels quite similar, besides the fact that sleep is initiated by oneself, and the wakeful state transition for sleep is more gradual than for anesthesia.

I think that distinction matters because strictly speaking, oneself only has access to one's own consciousness, and that defines one's own understanding of the word "consciousness". It's not possible for me to be you after all, and whatever inferences I make about other people being conscious is based on the fact that I experience my consciousness, and you are similar to me in some specific way (such as being, presumably, a human), therefore you must be conscious. Of course, I'm taking a materialist stance here but that's what's practical to talk about anyway.

I had some serious surgery a few years ago and paid attention when I went under to see if I could recall anything.

Nope. You don’t exist for that time. Anesthesiologist counts down 10, 9, 8, 7, and then I was teleported to the recovery bed.

I consider it incredibly weird and very unlike sleep. Consciousness is off, instantly, then back.