I'm working with a Xilinx Spartan-7 (Arty S7-25) FPGA and was wondering if the "P" and "N" for the PMOD differential pairs are reprogrammable or swappable? Will swapping them damage any components or just not work? I notice their naming scheme but is there any significance beyond that. The banks I'm referring to are the JA and JB PMOD connections (See JB bank below). Thank you!