I recommend caution. While you can connect them as Zerowing has suggested you could have problems balancing the current through all PNP transistors because you no longer have the ballast resistors at the emitters. While you might be able to transfer the resistors - previously at the emitter of the NPN devices - to the emitter of the PNP devices your current limiting function in the LM723 will not work anymore. I am not saying that the Sziklai approach will not work. What I am saying is it will not be a matter of simple conversion to Sziklai. Additional work needs to be done.