You might be interested in this:
https://forums.developer.nvidia.com/t/custom-initrd-for-nx/232508/15
Also, understand that all partitions (other than rootfs) are signed. The default is to use a NULL key. Possibly a clone would fail if the signature is not handled correctly, but basically I don’t think it is practical to clone them. There might be a way to trim the signature off, and then replace the file in the flash software such that that content is used during the next flash. However, I have doubts that this would help, e.g., there is also EEPROM memory on dev kits which might contain part of what you want. Really I think someone must be able to find out first what those addresses correspond to.