I believe (but could be wrong) that the Yugo M48 mauser has a slightly shorter action/bolt that makes it incompatible with earlier K98s. I have never had one in my hands, so feedback appreciated. Please let me know if I'm harboring internet rumors in my house.
I have had 2 K98s and a Spanish M43 and loved them all. I have a friend who had a Yugo M48 and loved it (after he got the cosmoline off). I think half of his happiness was being able to gloat about getting a brand new 8mm rifle for $100 (which I completely understand).