I Can say this - pilot movie was total Maverick!!! Bret and Bart meeting their 'new' cousin Ben. The actual series I have only seen two episodes of. Thought they were good. Well worth getting the rest of the series. And like the above poster wrote, it completes the total Maverick collection.
Don't think I ever saw the series but from all the information I have read on the show. Bret is only in the "New Maverick" movie that was made a year before the series. It doesn't list him as appearing in any of the 8 Young Maverick episodes.