Contradiction with Ezekiel 37:21
This verse talks about the unity of Israel under one nation, whereas Ezekiel 48:24 describes the division of the land among different tribes.
Ezekiel 37:21: And say unto them, Thus saith the Lord GOD; Behold, I will take the children of Israel from among the heathen, whither they be gone, and will gather them on every side, and bring them into their own land:
Contradiction with Ezekiel 47:13
This verse mentions the complete border of the land for the twelve tribes of Israel, while Ezekiel 48:24 specifically details the portion for a particular tribe.
Ezekiel 47:13: Thus saith the Lord GOD; This [shall be] the border, whereby ye shall inherit the land according to the twelve tribes of Israel: Joseph [shall have two] portions.
Contradiction with Genesis 15:18
God promises Abraham the land from the river of Egypt to the Euphrates, which is a much broader promise compared to the specific allotment in Ezekiel 48:24.
Genesis 15:18: In the same day the LORD made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates: