Unique identifier for OU in AD?

Question

Active Directory

Hello!
There is a Domain with a branched organizational structure that is duplicated in the form of the same OU tree.
You need to transfer this "tree" to third-party software.
What attribute/identifier is there in an OU that is not tied to a name, location, etc. OU itself.
Those. if I rename the OU "Sale Department" to "Sale Department" this attribute/identifier should not change so that all bindings and the "tree" of OUshek do not "fly off" in third-party software!
help pls