Yes, most probably you will be able to use the 1600mhz as 1333 mhz.
The mainboard automatically downclocks the stick to the max supported frequency.
But, I recommend your to only buy a 1333 mhz as it doesn't always work correctly.
I've seen people facing issues by doing this.
So just buy a 1333 mhz stick as the price difference won't be much.