In case you're interested Airbii (
) work differently:
A340-xyz
x = the series. ie: -100, -200, -300 etc.
y = the engine manufacturer. 0-GE; 1-CFM; 2-P&W; 3-IAE; 4-RR; 5-GP Engine Alliance
z = the version of the series/engine combination.
Pretty sure that's right.