Ghost,
Probably the quickest way to hear similarities is to check out the video mash-ups from the time of Oasis' moment in the sun, when wags were bashing them for their pilfering of Beatles material. I'd guess that some of them are probably still available on YouTube. I know that there was one called "A Day in The Wonderwall" which overlayed the vocals from "A Day In The Life" atop the instrumentals from Wonderwall.
There was also a popular one that IIRC mixed Let It Be with Don't Look Back in Anger and another one that mixed an Oasis song (can't recall the title) with the vocals from "I Should Have Known Better". There are a bunch of these videos out there, they're occasionally amusing, and they tend to illustrate the point at hand. See for yourself if you find them convincing.
Happy Listening.
