WIRING FOR TWO BATTERY CHARGERS

I have purchased a NOCO 15a x 125v marine port plug that has dual pigtails to replace the single on the transom. The pigtails are 18 inches long inside the boat. I have batteries at the front of the boat for trolling and running my electronics and black box. I have a new NOCO gen10 4 bank charger and 1 single charger that i need for a lithium NMC battery (hence the double pigtail) I want to keep the plugs on both chargers rather than hardwire like the one charger is now. My question is can i use marine grade 6-8 ft extension cords to connect to the port on the transom? I cant see why it would be a problem but would like some advise and expertise.