The Yashinon lens used on the late Yashica TLRs was also used on many earlier bodies which have little of the almost cult status of the 124G. However, they can make images just as good, and can be cheaper. The older Yashikor lens has just three element, and should be stopped down for critical work. I've casually used a few models of Yashica TLRs, and find them less reliable than a Rolliflex should be.
While that's true, AFAIK all the 124s and 124Gs (and all the Yaschicamats before - the earlier ones had different names) have the Yashinon. The Yashikor was on the earlier models: