There's a reason for that. It was produced by LA Motown's producers (Hal Davis and Marc Gordon) and written by LA Jobete Music's writers (Marc Gordon and Frank Wilson), and arranged by LA Motown's regular arranger, and the session players were LA Motown's regular 1963-66 players on sessions for recordings that appeared on Motown released records.
To me, none of the other non-Motown cuts listed above sound really like Motown. The session players were not from Detroit, the arrangers were different from the Motown style. Many of them sound like NY or Philly cuts. To me, only Motown's LA Jobete recordings, and Detroit Soul recordings using Motown session players, arrangers and writers, sound really like Motown. Some examples:
"Lucky To Be Loved By You"-Emanuel Lasky
"That Was My Girl"-Parliaments
"You turned My Bitter Into Sweet"-Mary Love
"Let Me Know"-Mary Love
"Run One Flight Of Stairs"-Gloria Jones
"This Heart of Mine"-Artistics
"Happiness Is Here"-Tobi Lark
"My World is on Fire"-Jimmy Mack
"Me Without You"-Mary Wells
"Don't Lead Me On Baby"-Emanuel Laskey
"No Part Time Love For Me"-Martha Starr
"Poor Unfortunate Me"-J.J. Barnes
"My Mama Told Me"-Barbara Lewis
"Open The Door To Your Heart"/"Somebody Somewhere Needs You"-Darrell Banks
"The Touch of Venus"-Sandy Wynns
Don Davis recreated The Motown Sound at his Groovesviile/Groove City Records, at Golden World/Ric Tic, Solid Hit Productions, Thelma and Stax/Volt Records
Joe Hunter did so at Mickay's/Ring, Golden World/Ric Tic and Pied Piper Prod.
Mike Terry did, everywhere he went
Bob Bateman did at Correc-Tone, and on his indie Detroit and NY Productions
Mike Hanks did to some extent, as did Dave Hamilton and Ollie McGloughlin, Sonny Sanders in Detroit and Chicago (all used sometime Motown producers, arrangers and session players), Ed Cobb in LA