What is the difference between MAC PDU transport block in 4G and 5G?

5G NR
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Discussion about 5g vs 4g MAC PDU TRANSPORT BLOCK.
What is the main difference between MAC PDU transport block format of 4G and 5G.

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On LTE, the MAC TB is composed by:
Header (and all sub-headers), MAC CE1, …, MAC CEn, MAC SDU1, …, MAC SDUn, Padding (if any).

On NR, the MAC TB is composed by:
Hearder 1, MAC SDU1, …, Header n, MAC SDUn, Header n+1, MAC CE1, …, Padding (if any).