With a reyes renderer i reccomend exporting these settings: absolute tangent space vector displacement as well as smooth both the source and the target models.
No, it doesn't automatically weld verts on snapping by default, but you can download a script called Target Weld from CreativeCrash.com which will do it.
dunno what the context is but if you are figuring out targets at the same time you are doing the work... mentally prepare yourself to do it again. Like five more times.