I have prefect pitch... comes from playing acoustic guitar for over 40 years. I have never had a single issue between my ref and heritage were a NOTE was at a different pitch between the two speakers types.
when I used MCACC to get a rough set up of my speakers, I was very surprised at the sonic differences between the her. and ref., it was extremely evident.
since EQ'ing the speakers, I can still hear differences, but it's not so significant that I think that it is a mistake to run Ref. center and Her. fronts.
of course this is NOT critical listening, but in the HT realm.