Rxton 1 is KO1, Rxton 3 Pink is KO3, I doubt they are exactly the same. I have Rxton 1 Plus which supposedly has the same KO1 sponge as Rxton 1, but it feels different to me (all unboosted). The best way is to get 1 Rxton 1 and try it out yourself, it's only $5 after all.According to the table that Matt uploaded, Rxton 1 and 3 Pink both share the K-type sponge. So I was thinking they should perform relatively similar, especially after boosting. Rxton 1 is just $5 right now on Ali, so i'm tempted to stock up on a few if they boost well. The greatest feeling for me is to take a dull, boring rubber and transform it into a monster with boosting.