Reference for Yevamot 154:20

ומאי לא כי הכי קאמר להו לדידי לא סבירא לי דר' אליעזר בן יעקב לדידכו דסבירא לכו כר"א בן יעקב הלכה אני אומר

This common characteristic, however, [it may be retorted,] is different.<span class="x" onmousemove="('comment',' I.e., it is more restricted than that of marriage with an Egyptian etc. ');">³³</span> since in one respect it also involves <i>kareth</i>.<span class="x" onmousemove="('comment',' Even in the case of the bastard, kareth is involved as the penalty of his parents for the action which was the origin of his birth. In the case of the Egyptian and Edomite, however, there is no aspect whatsoever involving this penalty. The latter, therefore, cannot be deduced from the others. ');">³⁸</span>

Jastrow