Difference in version versus update

[hda]

I expect the corresponding numbers… ;) Or is base pointing to something different ?

[cmb]

The "built on" is the kernel build date. Since updates no longer have to contain a new kernel if nothing has changed there, the date of your snapshot can be newer than the kernel's build time. That used to not be true since every update updated everything. Probably ought to be changed at some point but not something worth bothering with at the moment.