But there are 2 differences between playing a cash game properly rolled and a tournament.

If you gamble as a 51% favourite and lose in cash, you reload and it doesnt matter you have earned a very small amount of +EV. Even if you feel you could take a bigger edge over your oponent you are still correct to gamble here (unless you feel he is going to hit and run). In a tournament you may feel it is better to wait for a spot where you feel you will get all in as a 60% - 80% favourite.

Second is the value of reloading.
E.g if u limp PF with pocket pairs looking to hit a set with a 100bb stack in cash game and reload to 100bb after each time you miss you are playing each hand indvidually with decent implied odds etc.

In a tournamnet each time you miss the set the value of your next limp is decreased since you can't reload. In a sense each missed limp can cost you 2x/4x/8x as much with each double up you gain in tournament from opponents who cover you.

I feel this justifies playing tighter (when limping) in a tournamnet than you would in a cash game.