B777 Seating Discrepancy / Question

I have a flight coming up on UA 958 ORD -> LHR and have seats in row 6.

When I look at seatguru and put in UA 958, Seatguru shows me a B777 ver 5 with no row 6, just the two BF cabins.

United Cargo just shows 777.

Flightaware shows a B777/Q.

UA's seating map shows the B777 with the mini-cabin with the seat I selected in row 6.

Any idea which website is most accurate for seating? I tend to lean to UA's own website displaying the correct seating arrangement, but I'm wondering if seatguru knows something the rest of us don't.

Any info would be appreciated.

Thanks!