1) In render settings you should select CentiLeo renderer. These settings have several tabs, one of them is Camera tab which has what you are looking for. Keep in mind that transformation motion steps implement the motion blur of moving object transform matrices (move, scale, rotate). Keep in mind that transformation step can be set up to 32 and this will work for Picture Viewer renders, but in IPR render the transformation steps will be limited to up to 4 steps for performance.
2) While deformation blur in the same Camera settings tab implements deforming vertex coordinates inside object with constant number of polygons.
3) Also if you have varying polycount of dynamic object then there is a Centileo object tag that you find. This tag has slots to connect with motion vectors (other object tags) if simulation software supplies these motion vectors. These vectors allow to implement deformation motion blur for varying polycount. Such as here https://centileo.com/news/150/centileo-for-cinema-0615/