Probably the closest thing in Judo to Koshi Nage is Sode Tsuri Komi Goshi. You can see the drawings at the same website mentioned by Don:
http://www.judoinfo.com/images/nauta/sodetkg.gif
When executed on both sleeves, it could look like one version of Ryotetori Koshi Nage.
Anyhow, that's not such an important issue