Various Impedance Speaker Setup with One Receiver

Considering replacement of the integrated amp driving front speakers + multichannel receiver the other surrounds, with one receiver for all.
The fronts are full range 4 ohm Piegas, the surrounds are 8 ohm Gallo Due.
Would using Arcam avr600 be an issue with the fronts being 4 ohm and the rest 8 ohm?
Have had Piegas driven by Cairn 4808a for about 15 years and love the sound, however need to use a one box solution now for both, 2 and multichannel.