Sorry I forgot to mention the actual values obtained from the models:
Shells chord saddle: Solids chord saddle:
178.73(10^-4) MPa 174.3(10^-4) MPa
Shells chord crown: Solids chord crown:
66.933(10^-4) MPa 65.705(10^-4) MPa
Shells brace saddle: Solids brace saddle:
90.343(10^-4) MPa 102.12(10^-4) MPa
Shells brace crown: Solids brace crown:
13.725(10^-4) MPa 13.987(10^-4) MPa
As you can see the values pretty much agree for both elements but this is a thesis and I have to explain the variations.