Both tunes land on the note c, then gradually step down by half-step to b-natural, then b-flat. In between, both share the note g in the first measure, and d in the second. And the final melodic notes in both songs is g.
The underlying chords are also very similar. Both start on C (though the former C major while the latter C minor), then on next measure on B-flat major, and on the third measure G major. In between, the chords are related, but not identical. The chord Em/B uses the notes b-e-g, while G+ uses g-b-d#. Both of these chords share the notes b and g, so they are quite similar. The chord F uses the notes f-a-c, while Dm uses d-f-a. Here, again, these chords share two notes - in this case f and a - so they, too, are quite similar.
Here are both melodies and chords written in lead-sheet notation, "It's Only Love" on top, "Being for the Benefit of Mr. Kite" on the bottom: