1.8 TDCi - What are the differance between the engine codes????

Hi all,

I am looking at the 1.8 TDCi (LYNX) engine and can see that there are two different types of this engine model with 92KW (123bhp/125ps) and 320Nm. The codes for the two engines are: QYBA and KHBA.

But what are the difference between the two engines????

I also know that there is a smaller 1.8 TDCi with only 74KW (100ps) and 280Nm - but this engine is listed to have FFBA as the engine code.

Thanks for your awnser