I have my own schedule for a job but i need to show the differences between my schedule and another persons schedule (for the same job of course) on my own schedule.

which column should i use for entering his dates? it will not be one to one matched activities but i can still match many items or at least summary activities so that is no problem but i like to know which column should i use for entering and then for comparison too

for example to enter their start and finish dates should i use one of the start1,2,3,4.... and finish 1,2,3,4 columns?

and then how can i show the difference between my finish and start dates and his finish and start dates? i dont need to enter his links , just entering his dates are enough (i didn't see how i can enter his links anyway)