From the photo it looks more like the 1st version (transistor count alone) but there are 3 diodes in what appear to be the bias chain - that might be barely enough to have some standing current in the output stage
If your replacement transistors are of modern manufacture there could be RF instability due to them having a lot more gain at higher frequencies.
Given it's such an early design I don't think I'd bother to fix it unles I had some LM3886 going spare !
dc