I think both are shades of blue, but the left one looks more like Tiffany Blue and the right one maybe closer to mint. In addition to the color differences, there are also tiny differences that may not be very noticeable. You can see this the pearls on the right are a little more focused.
I took the photo this morning indoors when the natural light was bright, so the colors are pretty true to real life.



I’m completely torn! Which one would you pick?