Part numbers APX-VNG0031PSD-001 and APX-VNG0031PSD-002 have similar specifications to each other. I was not able to find the difference using the DigiKey Compare tool. The only difference I was able to find was in the Datasheet. On page 2 it lists the part comparsions.
The only difference between the two parts I found is the shunt resistance minimum.
Part number APX-VNG0031PSD-001 minimum is 2
Part number APX-VNG0031PSD-002 minimum is 5