Selective DNS response

Hi, I've configured a GTM responding on Internet, load balancing several services and all works great. Now These services have to be exposed on a private network, and the gtm has to load balance to this last too, so I've added an interface to this new network. Is it possible to add a pool on the existing wideip and write an IRule that selectively use the right one considering the destination address of the request? More specifically if I've an interface with x.x.x.x ip address on the internet and another one with y.y.y.y on the private network, can I say the GTM to answer with the intranet pool when the request has y.y.y.y like destination address? Thank you in advance