Not entirely sure, but it shouldn't be an issue. It's the exact same source files either way.

@Mentalist Traceur: You've got the right idea, but went about it the wrong way.
FYI, the three important lines are the apps that were run: "ldd flasher" "ldd ubinize" and "ldd mkfs.ubifs"
ldd - If you haven't already looked it up - lists all libraries required for a specific application. If you want to copy an application to another system, you have to copy all of it's required libraries also, or else it won't work.

Now, the applications in question... Where have I seen those before?.
;3

@f2thak: You won't know if you have a successful backup until you've seen that you can actually -restore- to it and have it boot. Sure, so long as the file-size is appropriate(200-300mb typically), you can tell that your rootfs -probably- will restore, but until you test restore it, you can't know for sure.