Same shmalzty lyrics, same basic 4/4, same intended audience of pubescent girls with their first crush. These songs are the "pinacle" (if it ever had such a thing) of the 100% generic cheesy love song. Every stupid whiny uninteresting love song since, all the way up through the latest from whoever won American Idol this year, traces it roots right back to these songs. Pure song factory mimeography.
They forgot what "love" songs could be, example - I Want You to Love Me by Waters
Love Me Do is all Gs and Cs.
Please Please Me is in As with a neat run up to F#m and C#m with an A-B-E bridge.
I Wanna Hold Your Hand has G5s, G6s, D6s, D5s, drops down to an E5 at the verse and stops on a B7, and then breaks into a boxy C-D-G-Em chorus
Can't Buy Me Love is C7s and F7s with drops to Em and A7 in the chorus.
Eight Days a Week is D-E-G with drops to Bm and G in the chorus.
These songs are very different, my friend.