Will 1333MHz DDR3 PC3-10600 Ram work in my iMac 27" Late 2013?

I just upgraded my Macbook pro from 2 x 4GB Ram to 2 x 8GB ram and now I have 2 spare 4Gb 1333MHz DDR3 PC3-10600 chips.

I was wondering if I could add these chips to my iMac 27" Late 2013 which has 2 empty slots?

Would they work with the existing PC3 12800 1600 DDR3 (2 x 8GB) that are currently installed?

I know that you should ideally match the chips but it just seemed a shame to waste the 2 spares that I have.

Thanks,

Colin