The difficulty is that at the moment he hasn't been assessed in any way, so there are a lot of potential outcomes.
For example, ds1 is gifted, but also has a diagnosis of ADHD with some aspergers traits (the sensory stuff you mention) and anxieties and phobias. In the past it has been suggested he may be aspergers / on the autistic spectrum, odd, or any number of things.
But there is also the possibility that he is 'just' gifted. It's really equally common for gifted kids to have over sensibilities / excitabilities, but it's also common for children with sensory processing disorder or aspergers to be gifted as well.
Until he has a thorough and extensive testing battery, you won't really know which camp he fits into (and tbh it doesn't really matter in terms of support - you deal with what you see, not what the dx is).
You might want to read about 'teice exceptional' children, you may also want to read 'misdiagnosis and dual diagnosis of gifted kids' and you may want to read up the over excitabilities stuff in isolation.
Even though we have a diagnosis, I am still not convinced that we actually 'know' why ds exhibits the same behaviours that your Ds does, and I suspect that a number of children reacting and behaving in the same way with different assessments and different psychs would actually come out with an array of different diagnoses.
I'm pretty sure that's not what you want to hear, but particularly with sensory stuff and anxieties, there is a huuuuuuuge overlap with all sorts of potential causes, most of which are equally possible if you happen to be gifted as well.
All three of mine are gifted, and two of them also have additional needs.
The camhs referral will go through everything and hopefully if they feel it necessary, get some testing done so that you have a clearer idea of what the underlying issue may be.