I wouldn't worry about the tonal difference right now, if all you wanted was to buy new mains and not upgrade the entire package then finding a match would be more critical. Because you are looking to upgrade the entire system I would buy the M80s then add the center next, then surrounds and or sub.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70