Exodus 12:48 And when a stranger shall sojourn with thee, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and
he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.
For Moses to say that it can only mean there is absolutely NO DIFFERENCE between what people would call a genealogical Jew and one WHO JOINED Judaism.
Otherwise, Moses could not say a proselyte becomes as one that is born in the land, but CLOSE to one born in the land. But he said TOTALLY AS ONE born in the land. TOTALLY.