150 4 stroke swap

[billyboatsandbeans]

I have two boats both with Yahama 4 stroke 150 motors.
A 2002 with 1100 hours and a 2004 with 400 hours. I would like to swap motors. It sounds easy but is it just a plug and play swap or is there problems to get into that are not obvious?
Should I swap the controls too or just the motors?

[boats.net]

You wont need to swap anything except motors and possible props if different type of boats.