What M6 product variant should I get?

I want to use the M6 DECT repeater to extend the range of one of my M900 base stations. When looking up the technical data of the M900 here: https://www.snom.com/en/products/wireless-phones/m-series/snom-m900/ I see there are two part numbers:

1. M900 | EU & UK | PN 00004426
2. M900 | Americas | PN 00004441

I am in Australia, and I am using PN 00004426.

For the M6 repeater, I look at the technical data for the M6 here: https://www.snom.com/en/products/wireless-phones/m-series/snom-m6/  and also see two part numbers:

1. M6 | EU / Americas | PN 00004586
2. M6 | UK | PN 00004639

How is it that the UK and Americas parts have swapped around in the M6? Is that a typo for the M6 description? I actually ordered an "M6" from an Australian supplier and they sent me the UK one PN 00004639. It doesn't have an Australian power adapter clip in it, so I cannot try it out by am wondering - should I be even using this one, or should I be using the one with PN 00004586 (first one)?

Strangely within the box of the 00004639, it has a power clip for UK (type G) but also USA (type A) and EU (type C). So why is there two part numbers for different areas, if 00004639 has power clips for EU, USA and UK?!