Full Idea
The statue and the clay appear to differ in modal properties (such as being able to survive squashing), and temporal properties (coming into existence after the lump of clay), and in constitution (only the statue is constituted of the clay).
Gist of Idea
Statue and clay differ in modal and temporal properties, and in constitution
Source
Kathrin Koslicki (The Structure of Objects [2008], 7.2.7.2)
Book Reference
Koslicki,Kathrin: 'The Structure of Objects' [OUP 2008], p.179
A Reaction
I think the modal properties are the biggest problem here. You can't say a thing and its constitution are different objects, as they are necessarily connected. Structure comes into existence at t, but the structure isn't the whole object.