well, yes, but no. there's a huge overlap, and AuDHD seems more than just the sum of its parts:
"Additional analyses revealed that individuals diagnosed with both ASD and ADHD are double-loaded with genetic predisposition for both disorders and show distinctive patterns of genetic association with other traits when compared to the ASD-only and ADHD-only subgroups."
"We identified seven loci shared by the disorders and five loci differentiating them. All five differentiating loci showed opposite allelic directions in the two disorders and significant associations with other traits, e.g., educational attainment, neuroticism and regional brain volume."
"Additional analyses revealed that individuals diagnosed with both ASD and ADHD are double-loaded with genetic predisposition for both disorders and show distinctive patterns of genetic association with other traits when compared to the ASD-only and ADHD-only subgroups."
"We identified seven loci shared by the disorders and five loci differentiating them. All five differentiating loci showed opposite allelic directions in the two disorders and significant associations with other traits, e.g., educational attainment, neuroticism and regional brain volume."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10848300/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7077032/