Barca would City the league. Would be just like City. 1-2 seasons of adjustment and then domination. Madrid would be like a Liverpool that never goes away. Both would dominate and would transform the league as a whole.
AM would struggle. Every other Spanish side would have it worse in England also. But Barca and Madrid would be even stronger than in Spain.
Madrid especially play down to opposition, but when pushed, they are every bit as physical and fast as the best of EPL, but with better players and more winning mentality.
Barca and Madrid are more than capable of adjusting to a different style, they just don't have to as often because the style in Spain is different. But with the players they have or had, and the superior technique and match winners, would be similar to Spain. They'd fight against each other for the title almost every season.