That's way, way too high for the PS4. It would be the best April for the PS4 ever, and an increase of almost 50% YoY. It would also put the XBO down around 40% YoY. Was the PS4 $250 last month?
I dont think the gap is that big. Here are last year numbers. http://gamrconnect.vgchartz.com/thread.php?id=216554
In April, the PS4 stayed in the Top 20 for the month (#11), even with the still new Switch and a few of its games taking some of the top spots. The XBO didn't even chart. Yes, it's quite obvious that the XBO was down YOY, while the PS4 was up YOY. And we already know the gap grew by ~400K+ in the first 3 months thanks to the prediction threads on Gaf. And both consoles stayed ~$250 last month.
But hey, that's what happens when one has exclusives, while the other does not. Well, it did have Halo Wars 2, but that went nowhere.