They will technically perform the same, the difference between those clocks will also depend on the amount of cooling each card gets. For example My 2080Ti has a rated boost of 1810MHz but It normally goes as high as 1900 or even 2000 if it's cool enough. those boost numbers will only drop to those rated boost clocks when it gets hot, and since each card has 3 fans on it, you should be able to set the fan curve to keep it as cool as 64c on full load, maybe even cooler.
But will those different boost clocks affect performance? Only slightly, like 5 or less FPS difference between those 2 cards. Because they are BOTH 2060 SUPERS! They have the same 2060 Super GPU die. So they are literally the same. If anything, RTX cards can overclock an extra 100MHz on its core clock using MSI afterburner of EVGA Precision.
So get whatever is cheapest, they're both decent cards in their tier range.