This is simply a curiosity, that updating a kernel takes the same amount of megas or practically the same as updating a browser like in this case Chromium.
Kernel being the mother of the system and not a browser.
I just do not know why, but it’s like this
linux-lts-4.9.50-1-x86_64 59,8 MiB
chromium-61.0.3163.91-1-x86_64 55,8 MiB