It's true tat only the procedure is different. However in Krushkal's algorithm sorting is done as regards the minimum edge is taken first. But in Prim's algorithm this is not done. The major difference takes occurs when their comparison is made on the basis of time complexity. The resultant minimum spanning tree which is obtained is the same.
Please kindly refer the link below for more detailed explanation which are given as under:
Hope it helps u. :)