Something well known to collectors of the R302-1 (1943) and R302-2 (1949) sets is that all 24 images from 1943 were recycled to generate the 1949 set.
I just posted an article to the SABR blog that shows you each of the "twins" side by side for the entire set and also provides some bonus background info on the issuer of the sets. Part scholarly, part silly, like most of my stuff, but you may enjoy it.
https://sabrbaseballcards.blog/2019/...card-set-ever/