If you want to directly copy and paste the exact same pitchbends, you will need to render a wav file from openutau first. Open that wav file as another track in vocalshifter, then you can copy+paste the pitch parameter to the other track.
If you want to use the reference track just for ideas, you can have vocalshifter and openutau open at the same time, and look at one window while drawing your own pitchbends in the other window.