[Freesurfer] Different output data

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Hello,

My name is Felipe and I'm a medical student from Brazil.

My research involves using Freesurfer to process neuroanatomical MRIs from several individuals. I'm collaborating with a PhD student and comparing my processed images with his. We use the same version of Freesurfer (7.4.1) and the same processing command (recon-all), but different Linux-based software and computers.

However, our output data is slightly different (brain segmentation volume, surface holes, WM hypointensities, and estimated total intracranial volume)

I'd like to know why this is happening? Should we get the same output data, or is this correct? Can I control other variables to get the same output data?

Thank you,