IMHO, no …
An animal rescue is a person, or a group, or an organization that for no benefit to themself takes in animals with the distinct and fully acknowledged thought, deed, and plan of action to re-home these rescued animals. This is a definitive distinction. One cannot call themself a rescue if they are not making the efforts to rehome these animals.
Do our newest additions to our mischief make us a rescue, I would say no. We have no intent in thought or deed to rehome these sweet little girls. They have found their forever home with us.
Would I say that we rescued these girls, yes I would, but not in the sense that they needed to be saved. I feel quite confident that their original keepers were providing for them to the best of their abilities and they simply recognized that was not going to be enough. They thought nothing of the expenses of pet keeping, it apparently had no bearing whatsoever on their decision to rehome these girls.
I feel extremely lucky to be able to take in these girls and gain the additional benefits of a great modified habitat that they were living in, and as we learn from rat keepers in our global community we are learning many things we will be addressing which includes the possible addition of two of our resident rats to the new girls home.