Yes. In fact I think all intellectual and emotional disorders/disabilities share some traits of autism but not actually be autistic, just like Aspies and autistics can share traits of other disorders/disabilities but not have them as co-morbids. This is why I don't view all non-autistics as neurotypicals like some ASD people do here.
I have a neighbour who does not have autism but is severely mentally ret*d. He loves people, but is less socially-skilled than me. He'd go up to random people and start monologing about random stuff, and doesn't seem to understand if they are interested or laughing at him or whatever. One time he even tried to hug a stranger, because he thought it was a kind thing to do, but he didn't realise that it could creep them out, which it did. His caregiver had to explain to them that he has a disability, and they kind of understood. He cannot read or write and he needs help bathing and other stuff like that, even though physically he is capable but mentally he cannot accomplish simple everyday tasks. He wrings his hands a lot when walking but he is not anxious or nervous, although he looks that way to others. He is a lovely fella but he is definitely not neurotypical. He went to a special school all through his childhood and he's been bullied by people in the neighbourhood before. His parents are trying to see if they could get him a part-time job, but his mental disability means his skills are very limited so he will probably have an even harder time getting hired than I did.
Also I have a friend with Fragile-X but not autism, but she basically only has me as a friend because she finds making friends hard, she got bullied a lot at school, and she's 27 but still has never had a job even though she's been trying hard all these years. Her intelligence is about average or just below, and she looks and acts normal and can do things for herself, but she still struggles with making friends and finding jobs.
_________________
Female