This question might not make sense, but..
How could I link a value from one server of a place to a value from one server of another place (both places are in the same game)?
(Also, the values shouldn't be linked to a player whatsoever, if you understand what I mean by that..)
ANSWER: You're looking for Roblox DataStore
Hint: You will create a DataStore and load/save the relevant data when it is necessary for either server of the same game.
It may not be very fast as data cannot be sent in real time from a database in any case. Technology has not proven that yet.