Here are three different recipes for orangy-pineapple juice. two of these mixtures taste the same and one tastes different.

recipe 1: mix 4 cups of orange juice with 6 cups of pineapple juice.
recipe 2: mix 6 cups of orange juice with 9 cups of pineapple juice
recipe 3: mix 9 cups of orange juice with 12 cups of pineapple juice

which two recipes will taste the same, and which one will taste different? explain or show your reasoning.