Its an UV, and the obejcts have to share same coordinates.
Its just a part of a bigger uvMap and all i am looking for is only to
select all the shown vertices and Merge them to their closest other verts.
I have done the left side manualy, but isnt there a button like in the
3d view where i can choose the range and just let the magic happen?
Perhaps try pressing w>remove doubles(in the uv/image editor view)…Then press F6 for threshold options.
Note: requires Blender 2.65 and that the uv’s you want to merge are selected.