Yes, but for any such reference frame if you know the distance between the observer and A and B, then after observing both A and B you can still deduct the true chronological order. But I get the parent's point now, for our purpose of observation there is no point figuring out this "true chronological" order anyway since a civilization could have achieved space flight 100,000 years after Big Bang but is at a distance so far away from us that the information may NEVER reach us due to universe expanding.