Can I reproduce data using "random()" in different operating systems?

I'm writing a SQL script (PostgreSQL) that inserts 50k+ rows of pseudo random data into several tables using the random() function, and I wanted to know if this function is stable between operating systems. I generate many columns of data, but the gist of the script looks like:

select setseed(0.5); -- make it reproducible

select g.id, floor(random() * 1000000)::int as code
from generate_series(1, 5) g(id)

Result:

id    code
--  ------
 1  249910
 2  520017
 3  461175
 4  227737
 5  184899

Different members of the team may use Windows and MacOS during development, and the integration servers use Linux. Until PostgreSQL 11 the docs included the somewhat cryptic [to me] message:

The characteristics of the values returned by random() depend on the system implementation. It is not suitable for cryptographic applications; see pgcrypto module for an alternative.

So my question is, is the implementation of random() identical everywhere, or will this script generate the different data in different operating systems?