Will 4.0 motor from grand Cherokee fit in 94 Jeep Wrangler?

No, a 4.0L engine from a Grand Cherokee will not easily fit into a 1994 Jeep Wrangler (YJ). While both are Jeep 4.0L engines, the Grand Cherokee's engine bay is significantly larger and the engine's accessories (like the alternator and power steering pump) are differently positioned. You'd need extensive modifications to the Wrangler's frame, body, and possibly even the firewall to make it work. It's a very complex and unlikely project for a home mechanic.