Aside from the other excellent advice you've been given, as the 1.8 and 2.0 have the same CR when standard, at 10:1, its easy to just back calculate the combustion volume. Although there will be a slight error due to the piston dishing, to all intents and purposes, a 1.8 on a 2.0 gives a CR of 11:1.

As has been said, that won't really effect the fuelling MAP, but check for the spark being a bit too far advanced under load.