Roll Command Question

I was wanting to know if someone could break down and explain to me the difference between 4d6k3r1 and 4d6rr1d1. They both get the same results more or less in roll20 for character creation, but the second input does tend to yield 2 points higher per roll on average with the limited testing I have done and overall I am just curious as to why or is it just a simple fluke?

Order of operations: the first formula rolls four dice, keeps the highest three, then rerolls 1s; the second rolls four dice, rerolls 1s, then keeps the highest three. An example of where they differ would be an initial roll of 1, 2, 3, 4: the first formula would keep the 2, 3, and 4 and yield 9; the second formula would reroll the 1 until it isn't a 1 and yield 1d5+8 (really 1d6+7, but the d6 can't be a 1).

Hmm, thank you very much for this explanation it makes a lot of sense now.

Is there any difference between 4d6k3r1 and 4d6d1r1?

4d6k3r1 : that rolls 4d6, keeps the highest 3 rolls, and rerolls any 1's

4d6d1r1: that rolls 4d6, drops the lowest roll, and reroll any 1's

The results turn out to be the same for that macro but if you roll 6d6 then it would be more different.

6d6k3r1: rolls 6d6, keeps the highest 3, and rerolls 1s (this has the result of 3 dice rolled)

6d6d1r1: rolls 6d6, drops the lowest die, and rerolls 1s (this has the result of 5 dice rolled)

Does that help?

Yes, thank you. :)