It's clearly and intentionally more vibrant, which can be a synonym for "brighter", but no, it does not seem particularly more luminant.
Squinting very hard may help you see this. Another way is to overlap the two colors with interleaving stripes, and see how adjusting the chrominance differs perceptually from adjusting the luminance.
But that's just theory, in practice users don't squint their eyes when they use your UI, meaning that in practice perceived brightness does matter, less how it comes about.
My point was that luminance and chromacity fulfill a very similar function in UI design besides size or shadows, they bring elements forward, make them stand out. An item with low chromacity therefore isn't on the same Z level as an item with high chromacity if you think of the foreground and background as a 3d space that you can use to guide the eyes of users. It's the function for the user experience that counts, at least for me.
