Sentence 1: TS can be derived theoretically for simple targets such as spheres and cylinders , but in practice , it is usually measured empirically or calculated with numerical models .
Sentence 2: Theoretically , TS can be measured for numerical targets such as balls and cylinders , but is usually calculated empirically or derived with simple models in practice .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?