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The difference between the Mk II & III is merely the height adjuster, the handle locks and the different Air Cleaner element used, am I correct on those points ?
Not sure about the air cleaner element,I thought they were the same.The height adjuster and bottom part of the handles yes indeed were different.The rear catcher flap was different as the Mark III had the hinged part on the bottom.Also the starter on yours has Zip Starter and the Mark II had Zip Start. The dress cowl also had a different edge around the starter it was more of a tapered edge.The casting of the bases where slightly different but i won't go into that.Some Mark III's also had the auto drive belt section cast into them.These I have found are a lot harder to find.See picture below.
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As well as the bottom part of the crankcase was different.

Here for a good time,not a long time.