Crucial 4GB DDR3/DDR3L Memory For Mac

Crucial 4GB DDR3/DDR3L Memory For Mac

I have a mid-2009 Macbook Pro 13" and a late-2009 Mac mini that call for DD3-1066 memory according to Crucial’s website.

Would this memory work in these systems?

What problems, if any, would or could result from running this 1600 memory in these systems?

Thanks in advance!