Small Engines (Lawn Mowers, etc.): replacing an Ex Mark engine, shaft diameter, briggs and stratton

Question
My older Ex Mark has a blown 19 hp Kawasaki manual start engine. I have a Craftsman rider with a 19 hp Turbo Cool Briggs and Stratton I/C Platinum engine that looks like it might match, though the shaft appears to be about 1" longer. Do you think this will work?

Answer
When replacing any engine the critical items are enigne bolt pattern, shaft diameter and length and electrical.

Is the shaft the same diameter?  If the shaft is longer, can you make spacers to raise the engine or is there enough keyway on the shaft to shorten it?

Also, check the engine mounting bolts.  Are they the same on both engine?
Let me know.
Eric