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Ha, too late!
I ran migration assistant last night and it seemed to work. only ball-ache was setting ups he new Mac once just to update to the same version of Ventura so it would work.
Not seen any issues yet, and a bit mindblown that even my development stuff, (Homebrew, Hugo, Ruby on Rails, Postgres) all seems to be working without any intervention. Only thing I actually had to do was authenticate with Lightroom and with my email servers.
Thanks @kboy and @mmccarthy for the tips.
Possibly too late now, but Migration assistant is a bit shit @beseku
Personally I would back up to an external drive as @mmccarthy suggests using SuperDuper! then restore that to the new one. However you'd have to use a bootable USB with MacOS and SuperDuper! on it because you can't wipe the boot drive.
This may sound like a big faff but it's less faff than migration assistant fucking it up. Ask me how I know...