hc-3 LinearTrack merging position data between sessions of same day

Hi,

We are analysing data in the hc-3 dataset recorded during linear track behavioral task. Since spike sorting was performed across sessions of the same day, we thought about pooling sessions of the same day for our analysis. However, the position data does not directly match between sessions of the same day. For example, see the attached figure for position data from ec013.37 linear track sessions.

Is there some rule by which to merge position data from different sessions on the same day?

Thank you.