Well, they were all prototypes and there are two, or three, variants depending how you look at it, made by Krupp-Gruson and Rheinmetall-Borsig. There's also Sonderkraftfahrzeug 165/1.
The surviving Heuschrecke 10 at Fort Sill Field Artillery Museum has got the round holes in the drive sprockets but that was after the restoration because initially it had sprocket wheels with square holes. This can be seen if you look at the pictures of the same tank before and after restoration. (see further discovery about this towards the end!) Which of them that are correct I don't know, but the Heuschrecke IVb was first based on a shortened Panzer 4 and later the Geschützwagen IV chassis and they both, as far as I know, have the drive sprockets with the "square" holes in them by standard.
Also why are some of them called Heuschrecke 10 and some Heuschrecke IVb?
Regardless they're all pretty much just prototypes and when making prototypes you use what you have for donor chassis and who knows what configuration, or repairs, they have?
One final observation is that the sprocket wheel with the round holes are only photographed on the right side and never the left. Could it be that it's got different type sprocket wheels on each side?
This is something I just discovered and after a fair bit of searching I can only find pictures of a Heuschrecke with round holes pictured from the right side... Are we on to something secret here?
Good luck with the fabulous build! I will dig a bit further on this to see if I can find a picture with round holes on the left side or if there's some substance to my find.
The surviving Heuschrecke 10 at Fort Sill Field Artillery Museum has got the round holes in the drive sprockets but that was after the restoration because initially it had sprocket wheels with square holes. This can be seen if you look at the pictures of the same tank before and after restoration. (see further discovery about this towards the end!) Which of them that are correct I don't know, but the Heuschrecke IVb was first based on a shortened Panzer 4 and later the Geschützwagen IV chassis and they both, as far as I know, have the drive sprockets with the "square" holes in them by standard.
Also why are some of them called Heuschrecke 10 and some Heuschrecke IVb?
Regardless they're all pretty much just prototypes and when making prototypes you use what you have for donor chassis and who knows what configuration, or repairs, they have?
One final observation is that the sprocket wheel with the round holes are only photographed on the right side and never the left. Could it be that it's got different type sprocket wheels on each side?
This is something I just discovered and after a fair bit of searching I can only find pictures of a Heuschrecke with round holes pictured from the right side... Are we on to something secret here?

Good luck with the fabulous build! I will dig a bit further on this to see if I can find a picture with round holes on the left side or if there's some substance to my find.
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