Is 0.15mm a big size difference for diamond studs?

[wtd]

I think this question has been brought up before, but I couldn't find any solid answers.

I'm shopping for some diamond studs and the vendor I'm working with had a pair of preowned studs with 0.78ct and 0.80ct F VS1 diamonds. They look great visually, but I took a look at their certificates and one of them is 0.15mm smaller than the other. Will this be hugely noticeable? Should I pass and find something closer in range?

 

[CedarRapids]

Not noticeable side-by-side. Definitely not noticeable when each stud in its own earlobe!