If you watch the movies back to back, you’ll notice that half of Ace’s lines are exactly the same as Pet Detective. In other words, the writers only re-wrote half to three-quarters of the script. They must have thought jungle = animals and therefore the perfect setting for an Ace Ventura movie, but somehow the focus seems too narrow and doesn’t do much for the movie.
It was established in the first movie that Ace has an affinity for animals, but in this movie it seems a little extreme (he overreacts when he sees a lady wearing a fox around her shoulder, and when he sees Cadby’s “hunting trophies”). Not that you would expect any less, but this may as well be an Animal Rights film with Jim Carrey as its spokesperson.
If nothing else, at least the Ventura character was consistent from one movie to the next (although I don’t really buy Ace becoming a monk).