Hi awatean - Thanks for your comment. Brighton had no direct sister, about the nearest in appearance to her was the Maid of Orleans which was built for the short sea routes. See comparative view here:http://www.shipsnostalgia.com/gallery/showphoto.php/photo/40955/title/brighton-and-maid-of-orleans/cat/502 Derek
"Maid of Orleans" came out in 1949 and "Brighton" in 1950. Denny's of Dumbarton the specialist cross-channel steamer builder updated the 'style' of their buildings every few years. Another (earlier) pair (with widely differing service requirements) which looked similar were:
"Invicta" of 1940 http://www.photoship.co.uk/JAlbum%20Ships/Old%20Ships%20I/slides/Invicta-03.jpg
"Falaise" of 1947 http://www.photoship.co.uk/JAlbum%20Ships/Old%20Ships%20F/slides/Falaise-08.jpg
Following on from Eddy's comment, this may be of interest: http://www.ournewhaven.org.uk/page_id__1615_path__0p69p87p70p.aspx
Whilst I concur with Eddy's point, the page doesn't include Falaise and Invicta as 1) Falaise wasn't built as a Newhaven ship and 2) by the time we did get her in 1964, the similarity had lessened somewhat.