Since Badfinger has been mentioned a couple of times here is a video.
Badfinger - Day After Day (1971 - HQ - Restored) - YouTube
Badfinger - Day After Day (1971 - HQ - Restored) - YouTube
Some of Jeff Lynne's songs have a Beatles sound to them, but that may reflect the involvement of George or Ringo with various projects, such as Traveling Wilburys.
I do not think O'Sullivan really sounded like Paul, but this is one of my favorite songs."Alone again (naturally)" always sounded like a Beatles song to me when I heard it from lo-fi radios in later part of the last century. I swore the vocalist was Paul.
Some of Klatu songs were beatle-esque
According to this site (and I've read this elsewhere), it is not an accident that ELO sounded like some Beatles songs "Formed in 1970, Jeff Lynne and Roy Wood's intentions with Electric Light Orchestra were 'to pick up were "I Am The Walrus" left off'." A New World Record - Vinyl LP - Electric Light Orchestra