I dont see much in the way of mods besides different transistors, compensation on the predrivers, and the removal of the high frequency feedback stage from the drivers. The schematic is slightly misleading as it shows only one pair of outputs when the PCB has 3.
I don't understanding the moving of the 390uf input cap outside of the input resistor. This defeats the RC input filter, to what purpose? That cap will load the preamp at high frequencies, for what reason? Don't see the need for the input coupling cap, either.
bvp9223 without doubt both topologies look good,
however topologies dont make amps measurements
do, cause at the end of the day precision wins and
the sound is presice and beautiful, a product of art
rather than science