It's pretty unlikely either of those kits will run at 3600mhz with a 2700x at least not with the advertised timings and voltage. . According to the memory comparability list for the msi carbon X570 board while using a ryzen 2xxx CPU the highest speed kits supported are 3200mhz.
^ Good point, the fastest I could get my RAM to Run (Manually OC'd) with my 2600 was 3400.
But, I'm guessing that since he has an X570 MB that he will be upgrading to a Ryzen 3000 at some point and will be able to run them at 3600 (or more) when he does.