The old and new levers are so different, it really would not be possible to switch them.
Look at the clutch switch, itself. It's made of the finest quality plastic and is very easy to damage. It's a round cylinder that gets depressed when you pull the lever in. Make sure it's still there, as it's easy to break. Look at when, or if the lever contacts the plunger. Se if it lines up, or pushes the plunger far enough.
This perch is new to the ninja 1000, but it's really old. It was in use as far back as 2006, and maybe even earlier. Asv probably realized this and used an existing lever from their stock.