quite a difference in bandwidth 10mhz versus the 4mhz for the onsemi devices. I would be very careful about using those devices for fear of the amp turning into an oscillator. You might have to add some compensation in the driver stage if you plan to use those on semi devices.
Also replace the driver transistors and the fuseable resistors. If you don't you're asking it to blow up again. Member quadbob usually has original sankens at a price. You might ask him.