I don't think the two are the same. Maybe there is some more general meaning for the two phrases, but for me chasing losses means that you can't take a break from your current gambling session and want to gamble until you recover again. This is usually a very dangerous situation as we become only focused on the amount we need to win and don't focus anymore on the risk we are taking for it. In many cases chasing losses is going to lead to higher losses. Finding closure for me means to accepting your current position and finding a compromise. This could be for example to tell ourselves to quit after out next win, even if the whole session is a loss. The approach is much more rational as it accepts the loss we made, but at least let's us end on a win. It can also help to focus on our overall bankroll and to make sure that we can always come back to gamble another day.