No, you cannot swap the SD cards between different models. The SD card has the kernel and uboot image. These are specific to the device. That also means that an image of the SD card won't work. And the method you link to won't work for exactly the same reason. After all, it is just a different way of producing the image. And even if you have an image, I do not know of a way to restore one to the Libra H2O, Elipsa or any other device that does not have an internal SD card.
This is a topic that has been discussed a few times. People have transferred the books and the database, or parts of the database from one device to another. I have made suggestions about what I thought was needed to be done, and some people have stated what they actually did. Those discussions should be findable. But, it is done by copying files, not by using images.
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