This is a bit more complicated, Linux is a more generic name that encompasses many variants.
Normally when you say plain "linux" it is similar to when you say plain "windows", it is usually referring to only the latest versions for desktop computers.
But in the same way that you have windows 98, windows CE, windows XP, windows 10, etc.
You have many versions of linux.
The gadget you mention has an ARM CPU, so it must use a version of linux for ARM, which is not compatible with the linux you would use on a desktop PC.
Rather, it would fall into the port family that should be used with raspberry (it also uses an ARM CPU).
So no, you can't use the same executable that is used in linux, you need one specially designed for OpenDingux.
If you're lucky, it could be just compiling it in OpenDingux and play, but normally, it's not that easy, these gadget usually have many problems with library dependencies or even with the code itself (OpenGL version for example) which is need to solve by hand.
Personally I have no experience with this version of linux and gadget, so I couldn't help you more, but I hope this little explanation will help you understand why it's not as simple as copying the AppImage that is used in linux.