For all practical purposes, API 682 3rd Edition is the same as 2nd Edition.  The completed 2nd Edition was submitted to the ISO Organization for approval as their ISO 21049.  At the time, API and ISO had an agreement to jointly issue standards.   The ISO Organization made slight editorial changes to 2nd Edition, including correcting typographical errors and unit conversions.  Therefore, API had to re-issue a corrected 2nd edition but choose to label it as 3rd edition.  API 682 3rd Edition was published in September 2004.

API and ISO no longer have the agreement to jointly issue standards.  The 2004 issue of ISO 21049 is the only issue and plans to update it are unknown.