This all depends on your panel. Left and right are meaningless, it's what the bars do and how they are mounted that matters.Putting in a 30 amp circuit breaker into a subpanel I have in my basement. I understand that I will need to ground to the bar on the right instead of on the left since it is a subpanel.
This all depends on your panel. Left and right are meaningless, it's what the bars do and how they are mounted that matters.