Hi
Well, this is not hard to comprehend.
Each major version like 8.1, 8.2 and 8.3 has it's own timeframe on when patches are released.
Finding a bug in 8.3, this has to be implemented into both 8.1, 8,2 and 8.3. At this point the release date for patch on 8.2 was earlier than 8.3.
As mentioned earlier, if TAC has not given you a specific release to upgrade to because of a bug or if you are experiencing some strange resulst, just wait for the same patch to be released for 8.3, no biggie
Roar