No, it wouldn't be the same
Theoretically you can crit one target 20/20, though it's highly unlikely not to say impossible. 20% does not mean you'll crit 1/5 either, it just means that you have a chance of critting 1/5, but the dice could lane so you crit 1/10 followed by 2-3 crits followed by no crits for the next 5-10 hits.