Philips model numbers with /00, /10, /12, /27 in suffix: what's the difference?

All the headphones listed on Philips website have model numbers that end in /00, /10, /12, or /27. For example, the X2HR has two options: X2HR/00 and X2HR/27

Someone on Reddit says that the /27 is the North American model and /00 is the European model, but I don’t see any evidence of this on any of the product pages. Since this is the US site, why would they display EU model numbers?

Anyone happen to know?