virtualbox virtualbox-host-modules virtualbox-guest-iso are for your HOST system, if your system is Manjaro or Arch based system, in principle the host-modules for your running kernel; example:
- if your host run Manjaro with the 5.8 kernel then
linux58-virtualbox-host-moduleswill be installed.
virtualbox-guest-utils will install automatically in the GUEST if you run Manjaro on a VBox install.
The DKMS are usualy good if there are no precompiled host modules for your running kernel. Manjaro provides them.
Make sure you do the according changes.