How to plot sEEG channels from multiple participants on one brain?

Hello,

I am trying to plot sEEG electrodes of multiple participants on the same head, and I am using headmodel from freesurfer and RAS locations of the electrodes. When I use RAS and headmodel of the same participant, the plot is fine, but when I use headmodel of one participant and electrodes of another, they are off. Is there a way to align them?

Thank you,