Yes but the Munchkins are organised into a lollipop guild, whereas the oompaloompas probably have no form of union representation.
That said in a straight one on one, my money's on the 'loompa's becasue Im betting the Munchkins like to guzzle down sweets, probably eating as much as an elephant eats, where do you think they'll be at getting terribly fat? I doubt they realise what will come of that, personally I dont like the look of it.
Loompas 6-4 favourites in any kind of ruck.