Basically, ground is ground. There is some ypes of installation that uses speically filtered grounds but general all grounds should be connected to one.
This is why ground rods are necessary on AC systems. The utility in most North American electrical systems tie the transformer cases to ground at the pole or transformer location. When the neutral in the feed to the service fails, the ground would carry the unbalanced load back to the transformer.
When the soil doesn't have enough minerals or moisture this doesn't happen.