Generate a 3D model
 

Suppose i have a set of images, where those images are segmented and saved in the .vtk format. Kindly note that these segmented images differ in size though they are in the same set.
My question is: can i open each .vtk file separately, then stack and build a 3D model inside ParaView.

Or else, can you please shed a light of how to construct a 3D model which are different in sizes and in the vtk format

Thank you in advance
(note: i am new to Paraview,, so i apologize if this question have been asked before which i did not come across with)