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Absolutely against it.
Those who want to play with identical castles should agree among themselves. For example, I don't want to, only as an experiment sometimes, depending on my mood. But there's no need to include this in the rules. Here's an example:
We're playing with Sam, he goes first and chooses Rampart. Many know that he's more likely to take Ivora than Kirra (and it's not just him). Then I say, "Oops!" and take Rampart. He has two options: give me the red Kirra (which is advantageous, in my opinion) or take it himself (which is unusual), something he definitely didn't expect, even though he went first!
And if we want to, we can still play Kirra-Ivora with him, Pirri-Mariussa with Spirit, and Merist-Dragon with Kostya, just like yesterday :D
Added 4 minutes later
Revolutionaries, I tell you!