Collaro & stacking 45's
Well, I can see that the American RCA changer was more clearly designed to accomodate the fat 45 spindle, which was very important here in about 1958 or so.
I'm guessing that the Collaro would require that you have inserts for your 45s and does not use a 45 spindle, as you can notice that the stabilizer arm only fits the Lp spindle size.
Also, what is that little black Witch hat in the left rear of the unit? Is that the little foreign 45 adaptor? If so, it looks like a manual play adaptor, for one at a time 45 cuing - which just ain't right. 45's are to be stacked on record changers (or used in juke boxes).