I have two NT kids- oldest and youngest- and my AS son is in the middle. Honestly, in our family, the AS son is somewhat of the "glue" between the other two. They often follow his lead in play and they get along really well. Once in a while, oldest son will complain that AS son is annoying him (usually with repetitive phrases or when AS son gets angry about terms like "literal" used incorrectly, etc), but that's not very common.
My kids are pretty close in age (18mo between them, 3 yr and 1 day between the oldest and youngest). The worst fights (which are rare) tend to be between the two NT kids. My kids have grown up having to share and share alike, including sharing rooms (for a long time, it was all three in one room) and sharing treats and toys. I think that has helped them bond well.