This config is showing up on an August IST-EWR trip with the extra leg room rows 8-10. Since only 4 A350's in the fleet (out of 16) have this, how likely is it to not get that config or are they really assigning tail numbers that far out?

Debating if it's with paying the extra ~$200 and not getting it (and then having to chase them down for a refund)