Best way to copy the $Splunk_Home/etc/apps/xx/local/ directories from existing Search head cluster (7.0.x version) to new Search head Cluster using deployer in 7.3.0 version

Can Some one suggest the best approach to follow while migrating the Knowledge Objects from a existing Search head cluster running on 7.0.x version to a new Search head cluster running on 7.3.0 version .. I am specifically looking for information on how to make use thne deployer_push_mode or any other best practices to follow