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As another poster above linked, it’s been shown to be effective since 2022: https://arxiv.org/abs/2203.05482

it works because Nex N2 is also a derivative of the original base Qwen model. If it was two completely unrelated models it wouldn't work.

Even merging models with themselves as shown here in the post how they got to the top of hugging face with two gpus

A few years back these used to be called "Frankenstein models"