The Sony FE 70-200mm f/2.8 GM OSS II SEL70200GM2 (On the left) is ever so slightly smaller than the original lens (on the right). Camerasize’s comparison doesn’t show a whole lot of difference, but you can see for yourself above.
Sony FE 70-200mm f/2.8 GM OSS II SEL70200GM2:
B&H Photo / Amazon / Adorama