For controlplanmachineset, for consistency, it's better to cover changing instancetype for all platform, now only aws and osp have covered changing instanceType, I think other platform also need this part.

aws example:   https://docs.openshift.com/container-platform/4.16/machine_management/control_plane_machine_management/cpmso_provider_configurations/cpmso-config-options-aws.html#cpms-changing-aws-instance-type_cpmso-config-options-aws