You don't want to be using a mono shock with an A style swingarm. Look at the leverage points.
It will cost you a decent amount to have a machine shop make the KX65 swingarm fit to your 110. Unless you're good buddies with someone... Just buy the correct mono shock if you're going to use a mono swingarm.
Yeah, The eye to eye length might be OK, but the 65 shock will have a much longer stroke and soft damping to be used in a linkless MX style set up. Well unless you want 13" travel and a 40lb kid to ride it.