Difference between 2 Saginaw PS pumps

Hey all. Needed to replace my Saginaw PS pump on my 360. Well....I ordered the wrong one.
Can't find any local but when I search Advance auto and Rock Auto they show both pumps.
The bolt patterns look the same and they are both threaded shafts. Anyone know if it will work and is one better than the other? Thanks.

My original:



The one I ordered: