Calculate the 'Time' difference between the two cameras. (Date, Hours, Minutes, Seconds??)
Select the photos from one camera to change and match times of the second camera,
MENU: Metadata > Edit Capture Time...
For a difference of Hours you could use option [Shift.....]-
For a major difference of Date & Time use option [Adjust....]- where you can select (highlight) each or all of the 'Corrected Time' field and all selected files are changed 'relatively' to their existing Time/Date.