Thank you for your message.
I have had a look in to this system and those parts for you. First of all, your system will support 16GB no problem at all. We have tested that model and we can guarantee that it will support 16GB of memory.
The part numbers you have listed are the same speed and type of memory. The difference in the part numbers is based on the memory we sell directly being Apple specific memory. Apple systems can be particular about what specific memory they can support so we make sure that we test all the memory that we recommend against a system.
Having looked at the parts, I would advise that both kits would be compatible with your system. This means it is up to yourself what ones you order. Either way, all our memory comes with a lifetime warranty and we will offer free support as well.
We do also have a great support section on our website. This section has a number of installation guides and videos. Please feel free to have a look at them after you order the memory.
If you do have any other questions at all, please don't hesitate to ask.
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