I think it's one and the same.
I think it's some kind of trophy or a running gag.
Could imagine this being an aborted baby of some "celebrity" or some sick shit..
DiCaprio photo looks like 90's while Bourdain and his chick pics seem to be from "our time"..means, if it's actually one and the same baby..it's been around a while and those three are not necessarily the only sickos to have played around with this.
"These people are sick" is a generous understatement.