User blog comment:Omega natsu2/Chapter 400: Wings of Hope, Predictions./@comment-3994996-20140911221724/@comment-7418318-20140913091738

In F-Rogue's timeline nobody at all died in the Dragon Invasion, since it didn't happen. There Lucy closed the gate before a single Dragon came through. The dying only started when Acnologia turned up, but we don't know when that happened. We only know that seven years after the GMG it was over, but that leaves a lot of time for Acno to come out.

As far as the life and death of people goes, this timeline and F-Rogue's timelines were the same after the GMG for all we know. Though without the Dragons Crocus would have suffered a lot less damage and Cobra would likely never have left the prison, since there was no need without any Dragons to fight.

Now theoretically those two changes might have been the reason for Tartaros to strike earlier than they did in F-Rogue's timeline, which in turn might have brought Acnologia out into the open sooner too, which in turn could push Frosch's death-time into the present too, IF it really is Acnologia who kills Frosch. But I doubt it, due to the reasons I already wrote before.