Latest Gnome 48 has came out and I'm hearing a lot of good stuff about it. Then I came to know that Zorin 17 is using Gnome 43! Can I upgrade to the latest version 48? Will it be safe?
Unfortunately, no. The desktop environment is a big piece of software, with a complex tree of library dependencies and that basically means that it's not something that you can change easily.
Zorin OS 17 comes with the latest version of Gnome available at the of release (specifically, at the time of release of Ubuntu 22.04, which is what it's based on). Zorin OS 18 is expected to be released later this year (no estimated date on that), which will most likely have Gnome 47 — consider that it will be based on Ubuntu 24.04, and that Gnome 48 has just been released.
The release schedule of Debian- and Ubuntu-based distributions is intentionally slow, with the purpose of having a stable system that doesn't change often. This has pros & cons, like everything else. If you want to use the latest version of certain packages, you'll have to look at something with a faster pace of release such as Fedora, OpenSUSE Tumbleweed or Endeavour OS.
No you can't, you need to use a different distro to get Gnome 48 (rolling release). Not sure if Fedora has it but Arch based distro's do have it for 2-3 days already.
No. Zorin is an LTS Distro. There is the DE fix. And there are no Upgrade Possibility.
If You want try Gnome 48, there would be the new upcoming Fedora 43 what offers this (should come in April if I remember right). Or You wait a bit longer, Debian 13 will bring Gnome 48 surprisingly.
Would be nice when it will be. But because Ubuntu 24.04 uses Gnome 46, it could be that, too.