Even with particle classes being identical, there can still be competition between the classes themselves... Not to mention, there are unstable, rare, and unse

Even with particle classes being identical, there can still be competition between the classes themselves... Not to mention, there are unstable, rare, and unseen configurations like pentaquarks and such. Some particles are unstable _because_ of their environment. In a different universe, they might be the populous, stable particles. P.S "Elementary" particle doesn't mean much since its definition shifts as we discover more about the structure of the universe.