I believe so, because I made pacman hook script.
Then I ran sudo pacman -Syu
Result :: Synchronizing package databases... core is up to date extra is up to date community is up to date multilib is up to date :: Starting full system upgrade... warning: gnome-shell-extension-unite: local (57-1) is newer than community (56-1) warning: zsh-theme-powerlevel10k: local (1.15.0+66+g3e515a7-1) is newer than community (1.15.0-2) there is nothing to do
Those warning are related to pacnew-files, I think.
A package can get to a new version, then because of X reason (it can be a problem in this version, or the update got pushed by mistake, or whatever reason), they decide to get back to a previous version, and if you got the updated version before the package get reverted to previous version, you then have a version newer than what is in the repositories, and pacman throws a warning message about it.
Also please don’t make lot of replies, edit your post instead, select what you want to reply to, click quote, and continue the message. Multi posting in a row is generally not accepted in forums.