I would guess that the original post is asking for a "soundalike" to the general public rather than to us anoraks. I've always thought 123 had that Motown feel although I couldn't pin it to a specific record, and this extract from a John Madara interview shows that Mr Gordy also thought it sounded like a Motown Record.
In an interview with Forgotten Hits, Madara explained: "In 1965, with '1-2-3' being the #1 record in the country, we were sued by Motown during the period when Berry Gordy was suing anyone whose records sounded like a Motown record. We were sued, saying that '1-2-3' was taken from a B-Side of a Supremes record called 'Ask Any Girl.' The only similarity between the two songs are the first three notes where the Supremes sang 'Ask Any Girl' and Lenny sang '1-2-3.' After that, there were no similarities, but their lawsuit said that our goal was to copy the Motown sound. Well, needless to say, Motown kept us in court, tying up all of our writers' royalties, production royalties and publishing royalties, and threatened to sue us on the follow-up to '1-2-3,' which was 'Like A Baby.' So after battling with them for two years and having a ton of legal bills, we made a settlement with Motown, giving them 15% of the writers' and publishers' share.