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