Can I install one 2GB DDR3 and one 4GB DDR3?

I have two 2GB DDR3 1333 Mhz sticks in my MacBook Pro. If I order a 4GB DDR3 stick, can I install my single 4GB and single 2GB stick and have 6GB of RAM or do I need to buy two 4GB DDR3 sticks so that each slot is equal?
If I can do this, can I put the 2GB DDR3 1333 MHz stick replaced from the MacBook Pro into a MacBook which takes DDR3 1066 Mhz. This MacBook would have 3GB total? One 1GB DDR3 1066 Mhz and one 2GB DDR3 1333 Mhz?

a.crowe wrote:
I have two 2GB DDR3 1333 Mhz sticks in my MacBook Pro. If I order a 4GB DDR3 stick, can I install my single 4GB and single 2GB stick and have 6GB of RAM
Yes
If I can do this, can I put the 2GB DDR3 1333 MHz stick replaced from the MacBook Pro into a MacBook which takes DDR3 1066 Mhz.
No, you need to put in the ram with the correct specifications.  If you dont, it could cause your mac to be unstable.

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