Comparison EEG digitized position

Hey,
I have an individual anatomical MRI and several channel files with digitized positions and I would like to display, on the same 3D MRI, the digitized positions from the different digitilizations to compare them. Could it be possible and how, please?

To display in 3D:
https://neuroimage.usc.edu/brainstorm/Tutorials/ChannelFile#Multiple_runs_and_head_positions

To display on the MRI viewer: no other solution than concatenating de multiple files manually.
https://neuroimage.usc.edu/brainstorm/Tutorials/Scripting

How should I interpret this figure (3D display), please?

Two colors = two EEG caps.
Add the head surface from the Surface tab would help.

This was designed for MEG, as in EEG it is not a common question to have multiple electrodes positions for a single subject. Therefore the display might be a bit weird.