Replace O/P transistors in Exposure IV power amp.....?

I have a sick Exposure IV, and am hoping someone can tell me what might replace the EXPP/EXPN o/p transistors please?
I'm aware that the MJ15004/3 combination can be used.

I'm 'informed' that the MJ21193/4 combo is also an option....and I'm interested in taking this further, as I have easy access to these 🙂
Can they be used, and would any changes to the circuit be required if I opt for 'em please??

I've attached a circuit diagram.
 

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