The TDI cylinder glow plugs will not fit any IDI diesel. However, TDI coolant glow plugs are the same as 1.9 IDI cylinder glow plugs. On manual tranny TDI's there are 3 of these in the water neck at the back of the head. They are used to heat the coolant leaving the head to improve heater output.
Also, I think that all 1.6TD and 1.9TD glow plugs are now the same. This was not always the case, but the new bosch duraterm plugs will replace almost everything, fast slow or otherwise. In any case the glow plug part # in ETKA is now the same, 1.6TD or 1.9TD.