The cles was updated over a year ago. You can tell on the damier azur and Ebene by seeing that the damier squares are not centered like the old model. They are aligned in a way where the squares are not the same on both sides where the seam is. Also, the Louis Vuitton Paris square is flipped on the back side. On the old damier one it was identical on the front and back. On the new one, the back has the square on the left side, not the right.
For the monogram, you can tell because the canvas looks more dull and muted, the actual LV and flowers are very slightly bigger, and the cles itself is bigger. I can easily tell just by looking , but it's a bit harder to tell than the damier. I have both old and newer models and once you have both you can definitely tell the size difference. The new one is thinner, more pliable too, and fits a LOT more