Is MPB DDR3 ram different?

No. Just make sure you have the same clock speed.

 

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Yes it is the mbp uses sodimm's

 

Get DDR3L Low Voltage RAM (1.25 or 1.35V) if you have a 2011 MBP and it you find them for similar cost as 1.5V. Saves a bit of battery life and often costs about the same. Don't pay for expensive RAM with fancy names it is never worth it.

 

No need to get the super speedy stuff either, make sure its CAS 9.
I have 8GB of Corsair Value ram in my 2011 13"

 

Which IIRC is CAS 15

 

It's the same the ram companies try and sell "Mac memory" for a few extra dollars but it's the same ram with a different sticker on them

 

Agreed on this, but the reputable companies selling it as MAC specific usually certify that it is tested and fully compatible with MAC hence the added cost. This is the same as THX certifications, they only certify that the hardware meets and/ or exceeds the standards for THX certification and have the right to carry the branding. It doesn't mean the hardware is better or more reliable (lots of manufacturers will build equipment to a higher standard, yet not carry the high end certifications so they can save on costs and pass the savings on to the customer).

 

Not quite, 9-9-9-24 is the SPD rating