Guardiola is adapting his style mainly and ONLY to the players at his disposal, not on the league, opponents etc.. If you think his style is different at City than it was at Barca or Bayern thats because of the different qualities of his players in these clubs
Yes, he does indeed tactically adapt to the strengths and weaknesses of the opposition (for example in Germany - to the fast transitions and counterattacks and in England - to the importance of winning the second ball) but the main principle of his philosophy remains exactly the same as it was when he started in 2007 at Barcelona B in Third Division