Nothing in common. Double-action revolvers (only kind U.S. police have carried in decades) have a long, heavy trigger pull - minimizing chance of idiot shootings. DA semis like Sig without safety also have long, heavy trigger pull for first shot; some on all shots - also making accidents unlikely. But Glocks are single-action light, short trigger pull on all shots - without a safety.
Not too argue, but to show my frame of reference, I remember some briefings and demos on SW revolvers and internal safeties. The instructor put a pencil through the barrel/cylinder, cocked the hammer, and tapped the trigger w/another pencil, releasing it and the hammer. The firing pin did not contact the pencil, showing you had to pull the trigger to get it to fire. When he pulled the trigger, the pencil flew out.
Once again the primary reason for unintentional discharges is the operator. The most importantt safety on any weapon is between the ears