Question RAM Question

Oct 5, 2019
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Building new computer with GigabyteZ390 Aorus Ultra MB with i7-8700K processor ( not purchased yet). I in error purchased online Ballistix 3200 RAM modules instead of the DDR4-2666 to go with the i7-8700K processor. The question I have is should I return the RAM when it comes and reorder or can i still use the 3200 RAM modules when they get delivered.
Looking for help ......its been 8 yrs since a total rebuild and I just missed that important detail. I think I was looking at the memory spec's for the board and just went ahead and ordered the DDR4 3200.

Your replies would be very appreciated.

Tks