Back about 1924, every arms maker in Europe was bringing out a new, or slightly revamped, military rifle. The FN (Belgian) Model 24 was an intermediate action, slightly shorter than the standard Mauser '98 action. One way this was achieved was to cut the barrel breech a bit for the extractor, something not done in the standard '98. The Czechs, meanwhile, were also making and selling their Vzor (Model) 1924, which is a standard length '98 action.
The Yugos bought tons of both. The Yugo M24/47 is an upgraded FN rifle; the 24/52 is an upgraded Vz-24. The Model 48 is a Yugoslav made rifle, basically identical to the M24/47, with an intermediate length receiver.
As you might gather, the Czech and Belgian workmanship is better than that from Yugoslavia. Otherwise, they are all about the same unless you are trying to put standard Mauser 98 parts or accessories on an intermediate action.
Jim