Are the pistons for a 1.6 NA diesel the same from the early 11 mm engines to the last 12 mm hydraulic headed engines? Yep, all 1.6 NA are the same as all 1.6TD are as well. (Goes in with the Volvo and Audi 6 and 5 cylinder engines as well). 1.5's have different pin diameters and pin to top height. On the other end you get into the 1.9 and 1.9 TDI. Loren