What you are trying to do could potentially work, but there are some things to consider and be careful of:
The short answer is, you'll have to roll the dice to see if it actually works, as the end result will depend entirely on whether your motherboard and CPU can agree upon a timing configuration to make it work. If it doesn't, I don't mind walking you through manually entering timings to get it to work, assuming you are comfortable making those adjustments.
With all of that said, I do have to ask; are you doing something memory intensive that would require more than 64GB of memory? Or do you simply not want to waste the current memory installed? If it were me, I'd simply go with the 64GB of memory and overclock that for faster performance instead of trying to make 96GB work. You'd have the spare 32GB kit as a backup test kit or as a spare kit for another system if you ever needed it. Just my two cents.
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