code and data are the same thing.

but thats too philosiphical to talk about or for you to understand.

Put it this way. You're implying code can be duplicated as long as they are advertised to do different things. But can't that conceptually be applied to data as well? I have the number 5 representing age, and I also have the number 5 duplicated somewhere else representing cost. 5 is duplicated because they are "advertised" to do different things.

Because code and data are philosophically the "same" the properties of "single source of truth" applies to both in the same way.