Migrating years of WHM config customisations to a new server.

Hi, I have an old whm server that I have tweaked a lot over the years both from within the ui but also manual config file customisations here and there. I need to move to a new server now, can anyone offer any advice to get all the little setting changes I have made (and can't remember what they were!) over the years onto this new server. I have migrated cpanel accounts many times so I am not referring to these, it's the WHM server config itself. Thanks.