Those covers will be interchangeable. Some of the older saws had a different arrangement for the stop button, but even those will interchange if you do something different with the stop.
The Super Series models (44, 55, 1-7X, 1-8X, 7XX, 8XX and CP/SP) had a different style/shape flywheel housing but the LH start models all share the same starter parts except the SP125 as noted above.
Other than the 1-40 and 1-50 any of the 1-4X, 1-5X, 1-6X, 200, 250, 300, 380, 440, 450, 550, and 640 covers will be interchangeable with the stop switch changes noted.
Mark