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It should make no difference to an existing installation. The point releases to LTS really just mean that the installer images are kept up to date.

So that means that if my system says it's version 18.04.1 and reports "your system is up to date", then I am up to date?

If you have done apt update and apt upgrade recently followed by a reboot then it will show .2 on login. I have just confirmed this on a VM.

Not true, they also come with hardware enablement updates (new kernel, graphics drivers, X and Wayland).