Would you say Guardiola use the tacticts of a Dutch way? This man plays the same way no matter where he is too but I get your point. Also am I the only one who liked De Boer?
Guardiola/Barcelona way is quite different from the Dutch model, but it has a lot of common ground. The inspiration is the same, but there are things that are different.
Some of them are.
Off the ball movement: Dutch model demands more off the ball movement away from where the ball is played, Catalan* way requires more movement nearer the ball action. Players are far more free in the Dutch model whereas in the Catalan one you have to occupy specific spots. Both require 'triangles' and other shapes to be formed as the ball is played, of course.
Passing direction and quantity in build up: Dutch model is more direct football, try to find the minimum required passes to get into the opposition area, Catalan method has more passes in non-dangerous situations and it follows a passing style that got its style from Handball. Dutch model has more forward passes, whereas Catalan one has more parallel and horizontal ones. The Catalan method tries to find that one vertical pass more often, whereas the Dutch model tries to slice defenses with their passing and player movement.
Shooting: Dutch model, as it is now, does not promote long range shooting, whereas Guardiola is more open to it provided there's a legit scoring chance. They're quite similar here, but it may depend on each manager. I find that devout Dutch managers discourage players from shooting and want a specific type of passing play even in the area in order to make the shot the most efficient one possible. Aragones who pretty much adapted Barcelona's Cruyff ball and created what we now call 'Tiki Taka' didn't want long range shots either, but it's generally more part of the Catalan system.
Ball height: Whether it is crossing, passing or even shooting, the Dutch way urges the ball to maintain its ground floor status. Catalan method doesn't mind crossing and changing play provided it is the best option to gain momentum.
Possession: Catalan method wants possession for the sake of possession. Best defense is to not give the ball to the opposition. Dutch method doesn't care about possession unless their quality of possession is high, it's more about the number of attacks you can create at a high standard. As a result, tempo is higher and defensive lapses are more prevalent.
As for your question, they're typically stubborn like this. They won't change the style no matter what. Cruyff himself wasn't
*For the sake of ease of wording, I think it's safe to call this Catalan as much as Aragones would probably be objecting to this, his surname just screams Catalan