Here are the two and their differences.

Funny thing is, the only real difference are the locations of the smoothly-machined races. Height and inner diameters are exactly the same, give or take 0.0005", which is reasonably for bearing press-fit tolerances (had some calipers handy) and the bolt holes line up perfectly.
Here's the stamped number for the bearing on the left:

And here it is for the right:

So are these the same? The spindle goes through the bearing and is secured on the other side... so could I actually use both of these?