It may be worth checking out the ‘Differences from the film’ sections of the Wikipedia & Wookieepedia pages for the novelisations of the films…
Star Wars - Wikipedia: https://tinyurl.com/43ca628u & Wookieepedia: https://tinyurl.com/3cd5d8bk
Empire Strikes Back - Wikipedia: https://tinyurl.com/3vyd6rp8 & Wookieepedia: https://tinyurl.com/49h3pfkm
Return Of The Jedi - Wikipedia: https://tinyurl.com/6tnjf7mf & Wookieepedia: https://tinyurl.com/2p8azefb
TPM - Wikipedia: https://tinyurl.com/4252ueru & Wookieepedia: https://tinyurl.com/37a8nfmz
AOTC - Wikipedia: https://tinyurl.com/yc4kj99v & Wookieepedia: https://tinyurl.com/2p9a3bp5
ROTS - Wikipedia: https://tinyurl.com/2p8734db & Wookieepedia: https://tinyurl.com/397vktkr
TFA - Wikipedia: https://tinyurl.com/2p9bzbpb & Wookieepedia: https://tinyurl.com/5cfjjbx3
TLJ - Wikipedia: n/a (could not find) & Wookieepedia: https://tinyurl.com/bdhx2wnw
TROS - Wikipedia: https://tinyurl.com/2s4cux9y & Wookieepedia: https://tinyurl.com/2p88vv68
Apologies for using ‘tinyurls’ - both Wikipedia and Wookieepedia articles can occasionally have ‘issues’ being linked on here due to url formatting on the site. The above info only really features outlines for any differences between the novelisations & films.