Hi Tallhoboman,
Let me look at your order. I’m very sorry for this! Did you get an xNT in an xEM box?
No you are not allowed a discount, you are entitled to receive what you ordered! And immediately! 
Again, I’m sorry for the trouble. This seldom happens thankfully. We will send you the xEM today.
In answer to your question, yes you can install in the same hand as long as the two chips are 5mm apart from each other; the reason for this is to minimize any cross interference between the two chips, which is admittedly quite minor… but it’s also important since theoretically the two glass tags if touching one another could cause either tag or both to break in the absence of any tissue between the two tags to behave as a cushion.
My best,
MDanger