Why are you reinstalling?
Manjaro is a rolling release, you would have already been at the same level as what is on the current ISO. Most, if not all, other changes like themes, default applications, etc. could be made manually.
Going from manjaro-kde-settings-18.0 to manjaro-kde-settings would make most of these changes for you.
manjaro-kde-settings-18.0 (Depends On manjaro-base-skel adapta-breath-theme plasma5-theme-adaptabreath)
manjaro-kde-settings (Depends On manjaro-base-skel breath-icon-theme gtk-theme-breath plasma5-themes-breath noto-fonts-compat
After that, you would need to merge whatever settings are under /etc/skel/ into your home directory, including the hidden files and folders. Then possibly update some /etc/default/grub settings, and install the grub-theme-manjaro package, if not already installed.