I presume the EXT will separate the preamp section from the amp section in the Mac! Do you have the owners manual?
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I took a look at the specs and manuals of both components, and I don’t see any concerns that would arise doing what you propose.
However you should absolutely set the Ext/Int switch on the Mac to Ext when doing so. If you don’t, depending on how the design is implemented the result might be that the outputs of the preamp sections of the two components would be connected to each other. Which in turn would give very poor sonic results and would also stand a good chance of being unhealthy for one or both components eventually if not sooner.