We also have to keep in mind that Guardiola's Barca was peak UEFAlona years. Had they came up against Zidane's Madrid it would truly be El Referee Clasico
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The Barca which Bayern demolished was at the end of it's cycle and not under Guardiola (Vilanova's assistant filling in). But that was just such a comprehensive dismantling of a playing style, that I'd have to assume Bayern would still cause major problems regardless of which tiki taka Barca they'd encounter.
Would truly be a case of the Immovable Object vs Unstoppable Force