2011 MBP 17” - A1297 | MC725LL/A | (but I’m not sure if it’s a 2.2 GHz or 2.3 GHz)
2011 MBP 15” - A1286 | MC723LL/A | (2.2 GHz)
1 - Can I take my two 8 DRAM chips (16 GB total) from my 17” and put it into my 15” inch with no problems? Are they 100% compatible?
(2 - 204-pin PC-10600 (1333 MHz) DDR3 SO-DIMM)
2 - Because of my doubt on the exact Sandy Bridge would this cause any compatibility problems?
3 - And I’m not sure if the 15” inch has the AMD Radeon HD 6490M or the matching “6750M” and Intel HD Graphics 3000 that the 17” inch has, would the DRAM swap cause any graphic problems if the AMD chips weren’t the same?
4 - And I don’t have the 13” inch version but I’m just curious if the same DRAM would be compatible with this model too?
It took me a little while to work out that MBP was Mac Book Pro.
In answer to the question - are the DRAM sticks 100% compatible - not possible to say because we don't know the details of the DRAM you are trying to replace, frequency, CAS, etc.
Personally I would try them because if they are totally incompatible, they won't physically fit in the slots.
If they fit then they will work but wether you notice any performance improvement may be hard to measure.
As for the graphics question, sorry, can't help on that one.