I don't understand why people think Sunak is any more pro EU than Johnson. If anything he is more ideologically opposed to a closer relationship.
This is what he said in July about the 2400 EU laws
www.telegraph.co.uk/politics/2022/07/16/rishi-sunak-vows-ditch-eu-laws-holding-britain-back/
Rishi Sunak on Saturday brandished his Brexiteer credentials, promising a bonfire of EU laws “getting in the way” of British businesses to trigger “a new Big Bang”.
Writing for The Telegraph, the former chancellor pledged that he will have “scrapped or reformed all of the EU law, red tape and bureaucracy that is still on our statute book and slowing economic growth” by the time of the next election if he succeeds Boris Johnson as prime minister.
Mr Sunak said he would task a Brexit minister and a new Brexit Delivery Department with reviewing all 2,400 EU laws transferred over to the UK statute book after the UK’s exit from the bloc. He would demand the first set of recommendations as to whether each law should be scrapped or reformed “within my first 100 days in the job”.