Abstract <p>There are a number of similarities between properties of two color and three color QCD, but there exist evident distinctions between them especially when diquark condensation phenomenon is concerned. It is discussed that prediction of charged pion condensation in dense quark matter has been shown to survive against diquark condensation first for two colors and then the same qualitative picture was reproduced in three color case. This is one more argument in favor of using two color QCD as a lab for investigation of three color QCD in particular of dense quark matter (with three colors) and its various phenomena that cannot be treated by lattice simulations.</p>