Due to differences between Manjaro unstable and stable branch - to use AUR - it is almost mandatory to use testing or unstable branch.
To educate yourself on use of AUR please jump to article About Manjaro and AUR
You don’t need the extensions unless you have very specific requirements.
Your issue is because AUR expects Arch package level - you are likely using stable and therefore the version discrepancy.
Switch to unstable
sudo pacman-mirrors -aS unstable && sudo pacman -Syyu