Most of the changes will affect automatically, but some you need to do manually.
My handy trick:
(credits go to various stackexchange posts)
WARNING: May or may not work and could break the system .
curl https://builds.garudalinux.org/iso/garuda/dr460nized/210507/garuda-dr460nized-linux-zen-210507-pkgs.txt | grep -Eo '^[^ ]+' | paru -Syu --needed -
(dr460nized, 210507 and garuda-dr460nized-linux-zen-210507-pkgs.txt may vary)
And then, change "paleofetch" to "neofetch" in .config/fish/config.conf if you want