Allowing permutations means that prims that can be rotated to match your original search are also permissible. This is usually fine, but should be disabled (by locking every axis) if rotation is impossible.
You can choose to allow any two axes to swap by selecting only the fixed axis to lock.
They're all spheres! Any megaprim can be turned into a sphere (or, for that matter, anything else) using the "building block type" menu in the "object" tab of the edit panel in SL.