Oxalus ID is the ultimate account that you can use to login on all products on Oxalus, including Gunfire AVAX & Gunfire Polygon
With a single Oxalus ID account, you can use to login on both Gunfire AVAX and Gunfire Polygon
Your assets from Gunfire AVAX and Gunfire Polygon different and can not be bridged from one game to another despite using the same account information to login