Is CloudLinux Solo compatible with WHM & cPanel?
Currently, no. CloudLinux Solo is not available in the cPanel store. It also does not have shared hosting features like CageFS and LVE-related features.
CloudLinux Solo does not have an update path to CloudLinux OS Shared. This will prevent the 'in place' replacement of the OS.
The CloudLInux Solo Documentation mentions CloudLInux may add such functionality in the future.