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This is likely due to different quality. Default quality of reconstructed items differs, simple open world drops are green, dungeon/arena/trial normal drops are blue, monster sets and perfected arena/trial sets are purple. I don't exactly remember where those 2 come from but Robes of Transmutation base quality is blue while Robes of Alteration base quality is green.
haha) i read first versions your answer and i go check quality in game.
You're right! But it confused me, two sets from the same category!
And even more, for example, Deadley Strike set the base quality jewelry is - superior, but other apparel - fine.
Soon new patch!