No comparison at all. A ball that ricochets around on a wet pitch in a crowded parallelogram and ends up in the back of the net, after a missed shot from a forward, is a freak. The backs did not "kick the ball into their own net" as you put it, and it wasn't by dint of poor defending either, in neither case did they have any control whatsoever over the freakish and very fast deflections that the ball took.
The first one just squirts across and hits the guy on the shin before he has time to react, the second one is actually bouncing out away from goal when it collides with the back who again has no control over it and no time to react. It's all clear as day if you look at the replays, those kind of bounces and deflections are one in a thousand and no back, no matter how good, could have done anything about them.