WHATS THE DIFFERENCE BETWEEN IN MAC BOOKS  MD212B/A AND ME865B/A

can you explain the difference between the 2 macbokk pro model numebrs MD212B/A and ME865B/A

OVERVIEW
Introduced     October 2013
Discontinued     --
Model Identifier     MacBookPro11,1
Model Number     A1502
EMC     2678
Order Number     ME864LL/A (2.4 GHz with 128 GB storage) ME865LL/A (2.4 GHz with 256 GB storage) ME866LL/A (2.6 GHz with 512 GB storage)
OVERVIEW
Introduced     October 2012
Discontinued     October 2013
Model Identifier     MacBookPro10,2
Model Number     A1425
EMC     2557
Order Number     MD212LL/A (2.5 GHz with 128 GB storage) MD213LL/A (2.5 GHz with 256 GB storage)

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