If you commit crimes in The North Yankton area, The NYPD(North Yankton Police Department) with NY suits will chase you. Also the LSPD will come as well for support. There's no way to stop the LSPD from coming to North Yankton but the NYPD won't come to Los santos.

You don't have to worry that the snow-covered Police car chasing you in the desert or wherever in Los-Santos. Because it's not a replacement.

Two kind of NYPD vehicles are spawned(the SUV and the old sedan)

Recommend going to North Yankton by using visit to north yankton mod:
https://www.gta5-hub.com/scripts/travel-to-north-yankton

Happy gaming!

Report any bugs please. I would fix if I can