The acidic smell* suggests to me that this was a regurgitated "hairball". If your snake seems healthy otherwise, I doubt that a vet can tell you very much, but if you'd feel better asking one, by all means do so. Fecal material, in my experience, always smells, well, like fecal material.*That this odor "wasn't as bad" as a previous regurge is because it's mostly hair, not other undigested content. Nothing reeks like a snake regurge...
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