My DC's have only currently been dxd with 'autistic traits'.
DD : low IQ, moderate learning difficulties. Most demand avoidant, most likely to lash out when overwhelmed, very hypersensitive, dislikes noises, doesnt do well in crowds, had speech delay, has hypermobility, dyslexia, dyspraxia, dyscalculia, auditory processing issues, least likely of my DC's to live independently.
DS1 : high IQ, well into the 130's at 8 & 10yo, no social skills, didn't have speech delay - in fact his speech was very advanced, under sensitive to sounds, touch, withdraws, anxious, lonely, amazing mathematical and scientific abilities, will do well academically but have trouble forming and keeping relationships & friendships, doesn't even notice crowds, just barged past them, no respect for authority. Will probably live independently but will need help. Most like Sheldon...
DS2 : average IQ, severe speech delay - first word spiken at 3y7mo, severe Hypermobility, dyspraxia, wants friends but is delayed with social skills, I think he is hyperactive, but inattentive type, always struggled with eye contact, but a grafter and despite being the 'most' disabled of my DC's, is also most likely to live independently and have a fulfilling life.
DS3 : Speech delay, seeming to have some Auditory processing issues, seems to have good maths skills for his age, at least with what he can show me, assessed as hyperactive 'with a high probability of ADHD', severe sensory issues, life threatening allergies, not really social, lacks eye contact except with me and his dad, God only knows how he will develop!!
IMO, they are all on the Spectrum, but in different places. Just my opinion currently, but assessments are coming. DS3's is first, then DD's.
The spectrum is wide...