How to Align the pieces with different scale?

Hi all, I'm making an puzzle game in which i'm programatically cutting the piece base on the mask and the resulted piece is of the different scale and random piece generated every time the game play. I want to align the object with each other. I know i can do this by calculating each piece height, width and then calucalte the center and so on.. . just curios is there any optimal or some kind of shortcut solution . thanks here for more detailed what i would like to achieve.