Man, I'm not trying to be an ass here, I promise!
But you are about to ask the manufacturer if that size works well, when they recommended it in the first place. What exactly are you expecting them to tell you? If you want to know how good they sound in a particular size enclosure then you HAVE to consider the port, other wise the comparison is pointless. I'm just trying to help you out here. I can read very well but you are just not considering everything you need to consider.
However, I will stop trying to help, I apologize for taking time to help you.