If you want to compare beer recipes, there is a new feature on brewmates.beer designed to make your life easier.
Well, not yet, I'm still working on it, figuring out the best way to select the beer/recipe's to compare, but you can already test it out if you know the beer id's you want to compare for example the Karmeliet recipe's .
If you want to compare your recipe versions instead, just click on the 'compare' button in the left pane of your beer and they will automagically show.