But both groups were capable of the same actions, so it's a matter of running it multiple times to determine the margin for error and the average.
I'm just saying that not all players are the same and I've had to adjust for every group in every edition. So saying version X is deadlier than version Y ... well it just depends. I said it above but I'll repeat: 5E is far less accidentally deadly and you are less likely to run into "Oops, you're dead" scenarios.