Syncing database across the world

Hi, im trying to sync databases across the world i have 2 server hosted one for US members and one for the UK people and i want to sync data without causing too much conflict for example if a player has on the US server 10 kills and on the UK server 9 kills it syncs with the US or vice versa. Im doing this because of connectivity issues and server lagging, im using c# with unity but i wanted to use something on mongosh