Although the chaotic ending of Grips, Grunts, and Groans is pretty much stolen from the Marx Brothers Animal Crackers it still works well. The Three Stooges throughout their career always were using stuff that other comics did and adapting for themselves. I think part of the reason is that they were not feature film comics like the Marx Brothers or Abbott& Costello, nor did they have the creative freedom that Laurel&Hardy did with Hal Roach. They worked fast and cheap and ground out the product and Harry Cohn at Columbia loved them for that.
The boys become trainers of a contending wrestler whom they accidentally knock out and Curly with false beard has to take his place. Curly has a phobia about the perfume wild hyacinth, some painful memories associated with same. It works on him the same way that the phrase Niagara Falls works in that famous 'Slowly I Turn' burlesque routine that Abbott&Costello use.
If you remember how Harpo demolished the entire cast of Animal Crackers than you know how this one ends. Grips, Grunts, And Groans I'd like to think is the Stooges homage to the Marx Brothers.