Re: Plus ca change
Of Sunak's 31-member Cabinet, 16 were Cabinet ministers under Johnson: Sunak, Raab, Braverman, Wallace, Zahawi, Dowden, Coffey, Shapps, Barclay, Gove, Heaton-Harris, Jack, Hart, Mercer, Williamson and Jenrick. Most of the rest were junior ministers or held other posts (e.g. Mark Harper was Chair of the COVID recovery group). I think it's just Hunt, Mordaunt and Mitchell who were back-benchers. Hunt and Mordaunt were Cabinet ministers under May.
(All information off Wikipedia. List of Cabinet members from https://www.bbc.co.uk/news/uk-politics-63376560)