Ive got a 48"bobcat and the kawasaki fc420v engine die. I have a new Kawasaki fh381v just sitting in the garage left over from a project. So I want to swap out the engines. Are the bolt patterns the same or will i have to drill new holes in the mower to secure the new engine? And are the crankshaft sizes the same? I looked all over online and found nothing on this topic.