I can only speak for myself... But I'd NEVER get a puppy when I had a 7 month old. My rule is no new dogs until my current dogs are fully trained. And then I wait about 5 years on top of that
I just don't feel it's fair to either dog, and a puppy will quickly pick up any bad habits or issues that other dogs in their family have. Aren't you dealing with reactivity issues with your RR? Imagine dealing with that on top of a brand new, insanely high drive puppy.
They could be Mals, but it's much more likely that they're Sheppy mixes.