I had the same experience as Piglet this year, I'm also Canadian. The clinical psychologist tell me that the change had happened in the DSM-5, but did explain that they were no longer using Asperger's as a separate diagnoses. We have high functioning autism as an official diagnoses, but we were mostly referred to resources typical for Asperger's as DS has no verbal deficits and no history of verbal delay.
ADHD and Asperger's are frequently co-morbid. I think a lot of the social skills parents work on with ASD children are also useful for guiding children with ADHD, so two co-morbid conditions may not make things more difficult. Parenting skills are very transferable.
OP, about having two kids with SN, being in this situation myself (one with ASD, one with an extreme expressive language disability, and a gifted DD in the middle). You always had two SN kids, now you just have a diagnoses and more help. It is difficult to raise an SN child, whether you have one or many. And you will need to take time for yourself and share the work load so as not to get burned out. But the work is not exponential with each child, just as people with large families of NT kids will tell you that their work didn't increase the same amount with each kid. You will use skills with one child to help your other child, even though she is unique. Your children will probably have some care providers in common, and they will get to know the family as a whole. My two sons have very different reasons they see the SLP, but she is a common person in their lives, as is the school YSF teacher. They become like family. The one difficulty we have had with two SN kids is conflicting therapy times. We've learned to prioritize when both appointments are impossible and to speak up and ask for more do-able scheduling when it is possible.