externalize() - Is this function even supported on Load Balanced environments?

I am thinking of using externalize() function to pass some value over WebAPI (both producer and consumer are Appian). This seems to work fine in lower environment which is not load balanced.

But the documentation says - "The externalized string must only be used in conjunction with internalize() and must be internalized on the same server". In case the process instance which performs the internalize() gets created in a different App Server than the process instance which did the externalize(), then would internalize() fail?