Which manual did you get? I believe both of those are for 2.5L engines. H420 is the nonturbo single overhead cam motor and h4dotc is the 4 cylinder dual overhead cam turbocharged motor.
Elaborating on Funkeymonkey's reply above.............
As we are talking "European/Rest of World" versions the base engine is the 2.0Ltr version.
The 2.0XT will be the H4DOTC,(
Horizontal
4cylinder
Double
Overheadcam
Turbo
Charged) however some of the common items will be covered in the H4SO(
Horizontal
4cylinder
Single
Overheadcam) naturally aspirated section, so you need it all.
The H4DOTC2.5 will be the newer 2.5ltr turbo version.
There is also a 2.0L H4DO but that appears to be later and used for LPG versions.