Which DW5809e part number for M6800 — 0453K0 or 0K2W44?

[Zazula]

Couldn't find any solid info on that online, asked at the Dell forums but to no avail, so here goes:

I have a Precision M6800 that did not come with a WWAN but I want to add one to it. Minimum cellular networks compatibility should be the EMEA region, but the wider (i.e., the more comprehensive) the better. Anyhow, I said to myself okay let's get DW5809e for this mission, but from what I see it comes under (at least) two discreet Dell p/n's: namely, 0453K0 and 0K2W44. So, what's the difference between those two, and which one should I choose?

Thank you very much in advance! 😊