But I also suppose the zone settings as well because everything in terms of the domain name is under my account and I am about to make his Cloudflare account from scratch under his email address. That is why I think both registrar as well as zone settings.
Cloudflare supports the move (transfer) of domain registrations between Cloudflare accounts when the source and target account both confirm the move. The move will result in the loss of all configurations and settings for the domain in the source account.
Actually, I could just remove the settings from my account in terms of the domain name of my client that I want to transfer to their account and just fill in the settings to be around the same over there right>?