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If I was to insert lots of rows into an empty table without primary key, nor any indexes. Varying number of rows might be inserted per transaction. Could I then be sure that a SELECT * FROM the_table; would retrieve the data in the same order on both Linux and Windows?
No, you cannot and should never rely on the order of rows in a result set from a query that does not have ordering constraints. Even on the same platform, same database. Even if it works in your tests.
Things like
VACCUMing your database (or some of theauto_vaccummodes I think) could change the relative block layout of your data and alter the result set even if nothing else has changed elsewhere (no inserts, no query plan change).