I don’t know if this applies, and differences might be from different compilers, but if both of you strip the modules it then match md5sum and size. See:
https://devtalk.nvidia.com/default/topic/1066506/jetson-tx2/why-the-built-modules-based-on-nvidia-official-kernel-source-/post/5401303/#5401303
The gist (assuming cross compile so it is from the tool chain):
<tool_chain_path>/aarch64-linux-gnu-strip -–strip-unneeded <path-of-kernel-module.ko>