show
results
http://www.javaboats.co.nz/store/c26/Air_Floor_Boats.html
http://www.aakronboats.co.nz/store/c68/BeachMaster_Inflatable_Boats.html
The item you are attempting to add to compare is a different subtype to the items(s) in your list.
Only items of the same subtype may be compared.