The 5 and 10 centavos from 2011 exist in both varieties, the new thicker 25 and 50 centavos only exist for year 2013.
Old issues bear a small letter C at left of the date. New issues bear a small BCTL at left of date (for Cental Bank of Timor Leste).
Upper row shows the existing previous designs. Bottom row shows the new strikes, with bolder numerals:
(images and information by Wolfgang Schuster)