Those will work VERY well.

But, like Marc said, the 1600s will work just a little bit better.
Here is the chart to which Marc was referring. It shows that although the 2000mAh AW IMR holds it's usable charge (down to 2.8v) longer than the 1600mAh AW IMR, the 1600 holds a slightly higher voltage over time. And since in the non-regulated mechanical PV you would probably want to change out your batt when it drops down to about 3.6v or so (where you will feel a very noticeable decrease in vapor), you can see on this chart that the 1600 takes slightly longer than the 2000 to drop to that point.
(In a well-regulated APV like the Vmax or the SMOKtech Gripper, where the voltage is maintained by the regulator, the higher capacity of the 2000 becomes an advantage.)
Ya can't judge a book by its cover, a turtle by its shell, or a battery by its (often false) mAh rating. 
Thank you to Super T Manufacturing.