Rear diff
 

Hi I renctly purchased a mazda mx5 mark1 1991 to mess around with and do up, the guys who sold me put a welded diff in and they gave me the old one but the connection to the drive shafts are completely differnt do I need to get new drive shafts to fit the diff ?
https://cimg6.ibsrv.net/gimg/www.maz...7c0efc1135.jpg
https://cimg5.ibsrv.net/gimg/www.maz...9cfe89123b.jpg