If it does work let us know - the price on the older model is no doubt less expensive, and it might be a great idea for a dedicated SSDR unit.
There seems to be some confusion.
From the manual of Smartsdr for IOS:
"You need at least an iPhone 5s or an iPad 3 or better (e.g. iPad Air 2 or Pro) and it needs to run iOS 9 or the upcoming iOS Version 10. If you have an old iPhone or iPad, I suggest to try the free Demo mode first, before buying."
Ipad 2=2011-model and Ipad Air 2= 2014-model not the same.
To identify you model>