Questions about octane and canned tunes

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Okay, so here it goes...I just purchased my truck and a CTS to go with it. At this point I am not getting any custom tunes on order for at least a few weeks as I have some other things that I need to buy for the truck as well right now. Can I run the 93 performance tune with 87 octane until I am ready to place my order for custom tunes or should I stay with the 87 tow tune?

I am planning on getting both custom performance and tow tunes for 87 octane in the near future, but am trying to make sure that I am squared away until that point.

Thank you.