Pork Barrel 2019 Jumpers

[SimonS]

On the Pork Barrel 2019 there are two jumpers to set depending on whether a MN3007 or MN/V/BL3207 is used.  Looking at the data sheets for all four the pinouts are the same so why are the jumpers needed?

[Scruffie]

One expects positive voltage, the other negative relative to ground.

[SimonS]

Thanks.  I need to look closer at the data sheets!