ForgotUmbrella [1] filed a request to merge volnoti-brightness-git [2] into volnoti-hcchu-git [3]:

I believe they are the same package, as they both use the same upstream URL. They both provide the same feature set too, although the description might suggest otherwise.

[1] https://aur.archlinux.org/account/ForgotUmbrella/ [2] https://aur.archlinux.org/pkgbase/volnoti-brightness-git/ [3] https://aur.archlinux.org/pkgbase/volnoti-hcchu-git/