@drelmoh those are compatible. Your 2011 uses Apple part number 661-5868 and your 2012 a 661-6594.
Early 2011 Macbook Pro 8,113"A1278EMC 2419MC700LL/A2.3 GHz "Core i5"
Early 2011 Macbook Pro 8,113"A1278EMC 2419MC724LL/A2.7 GHz "Core i7"
Late 2011 Macbook Pro 8,113"A1278EMC 2555MD313LL/A2.4 GHz "Core i5"
Late 2011 Macbook Pro 8,113"A1278EMC 2555MD314LL/A2.8 GHz "Core i7"
Mid 2012 Macbook Pro 9,213"A1278EMC 2554MD101LL/A2.5 GHz "Core i5"
Mid 2012 Macbook Pro 9,213"A1278EMC 2554MD102LL/A2.9 GHz "Core i7"