What is a main difference between gainsharing and profit sharing?

$$ gainsharing includes retirement options, whereas proft shating never does

$$ gainsharing divides profits up to group members when an objective is met, whereas profit sharing provides a relatively consistent proportion of profit back to members

$$ gainsharing entails partial ownership, whereas profit sharing entails complete ownership

$$ profit sharing divides profits up to group members when an objective is met, whereas gainsharing provides a relatively consistent proportion of profit back to members