Since Wizard's has purchased it, we have a fairly consistent meaning of edition that matches what a majority of the industry does when it issues a new edition (or does not), as well a clear example of what Wizard's considers a half edition. We also have clear views on what are changes that aren't an edition change, such as essentials for 4e, which while being a significant change did not invalidate any earlier material. I could take races or feats from the 4e PHB with an Essentials class and any other mix-and-match allowed.
Looking to what non-RPG publishing does, or what was done at the very begining of the hobby when the totality of RPG publishers was one, a nigh-amateur when it came to publishing, and standards hadn't roughly formed in the industry yet, are not particularly weighty points compared to what does the industry do now, and what does this specific company do with this specific brand. At least to me.
The
Duck Test tells us this is not the same edition, based on precedents that this company has set. So we still argue.