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Message: <blockquote data-quote="Voadam" data-source="post: 8851006" data-attributes="member: 2209">Except for 3.5 all the "half editions" are not significant changes that create incompatible mechanics issues. 3.5 to 3.0 was the exception though, more like AD&D to B/X. You could mix and match elements (and I did in both sets) but it took some conversion. I used 3.0, 3.5, d20 modern, Arcana Evolved, and Pathfinder 1e stuff in my d20 games with minimal conversions. I used B/X stuff in my AD&D games similarly.You can use classes from the 2e PH and classes designed by 2e skills and powers side by side though directly even though the S&P ones could be designed to be way more powerful. They were mechanically compatible.The incompatible differences between B/X and BECMI or RC are that thieves skills advance slower (there might be specific other differences like xp charts or whatever, but I never checked and used material from BECMI and RC era basic in my AD&D games as I had B/X stuff). I would expect to use a Merchant Prince or shaman class from the later Gazetteer series directly in a B/X game without mechanical conversion issues.Changing the AEDU power structure was a big deal for a lot of people, changing a fundamental aspect of 4e. For others not so much. In either case you could use the mechanics side by side without mechanical incompatibility issues.</blockquote>