16GB DDR4 - 2400MHz VS. 2666MHz

Sep 2, 2018
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Dell is sending a new XPS 8930 to replace the XPS 8930 I've had for a month that has problems. They told me the replacement will be equal to or better than my original purchase. My original XPS 8930 has 16GB DDR4 at 2666MHz. The replacement was just shipped and shows that it has 16GB DDR4 at 2400MHz.

Question: Would most experts says that the difference between 2666MHz and 2400MHz is insignificant both in speed and in cost, or should I cry fowl?

I find no way to determine the price difference from the data available on the Dell website.