When the carbs are on the main line will be the one on the bottom near the throttle cable and the pulse is on the side of the mag carb and return is on the top of the mag side.
That doesnt seem to be the oil tank line is it? Also the exhaust looks very dirty might want to clean it a little not sure if it will cause any issues.
Im pretty sure the flywhell itself is the same but the mag thing on the flywheel could be different. The timing would be off and would not run at all if it wasn't right. If you tried to start it, it would backfire or not try to fire at all.