I'm definitely a newcomer when it comes to this stuff, but I have learned a lot lately. Speaking with Alan Lofft he said the pink noise is the most demanding test for tonal consistency across the front stage. Room acoustics will have a great impact on this and in most setups at home, inherent acoustic issues with windows, furniture, etc. it may be impossible to get perfect tonal matching up front, even with all three being the same. That being said my little bit of knowledge would also vote for keeping all fronts within the same family of speakers, thus improving tonal consistency as best possible.
Rambling Sips
