Those are the outer dimension?
You really need to get the internal dimensions to make any kind of determination, as those can vary considerably.
There is a simple technique you can use. Take a corny keg and make paper cutout templates of the top/bottom and then line them in the freezer like you were squeezing kegs in there. Keep in mind that you will also have to account for space taken up by tubing and disconnects on the kegs, and any regulators, CO2 tanks, manifolds, etc. that you will be putting in there.