OK, replying to a fairly old thread, but you have posted two different types of VM. The one in the small photo is the VM that is for ibus cars, the ones in the larger photo are for MOST bus cars (the ones with i-drive). They are NOT interchangeable.

The VM's are completely plug'n'play swappable, so long as you replace like for like. So an analogue ibus VM can be replaced directly by a Hybrid ibus VM - the plugs are identical and so are the dimensions. They don't need any coding, unless you want to enable TV-in-motion in which case you can do it by an adapter lead or by software.