If I locked 20 random people up and fed them exactly the same

Not if their digestive system has pathogens beforehand.

If I locked 20 monkeys up and had them shitposting all day everyday would their shitposts eventually be the same?

>>7800555
Yes.

>>7799608
poo in the loo detected

>>7799608
im calling the cops

Probably not. Everyone would have at least subtle differences in the way their body digests, metabolises and excretes the stuff you give them. Definitely at least one would smell differently, assuming you can tell the difference to begin with.

>>7799608
No. The disparity between individual genetics, health, age, gender, posture and many other factors that effect digestion and alimentary elimination will cause test subjects to show chemical and physical variation in their feces producing different odors.