Reference for Chullin 116:17

ואי שפכן להדדי כשרה

Because every addition [of a limb] is deemed equal to the loss [of the limb].<span class="x" onmousemove="('comment',' The abnormal addition of a limb or organ is treated in law as if both the abnormal and also the normal limb or organ were gone. So that if in the absence of a certain limb the animal would be trefah, it would likewise be trefah if there were two of those limbs. (Rashi) .');">⁷</span>

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