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does it matters if I use 2666 mhz instead of 2400mhz
Yes it matters because Mac’s are very picky.
Your best bet is to get Mac compatible modules from either OWC or Crucial.
https://eshop.macsales.com/shop/memory/imac-2017-27-inch
https://www.crucial.com/compatible-upgrade-for/apple/imac-(retina-5k--27-inch--2017)-imac18-3
on OWC (MacSales.com) or Crucial.com.
memory iMac (Retina 5K, 27‑inch, 2017)
