This article presents findings from an empirical study in which we investigated Content and Language Integrated Learning (CLIL) students' linguistic resources in the L2 (English) to convey different Cognitive Discourse Functions (Dalton-Puffer 2013; 2016)--"Describe, Compare (Categorize), Report, Evaluate" and "Explore"--in two different contexts. The participants were primary school students (grade 6) participating in CLIL programs in Finland and Spain. To allow comparison, two sets of data were obtained by asking the students to write in response to a similar prompt in the area of social science (History in the Spanish context and Geography in the Finnish context). We compared the frequency of the Cognitive Discourse Functions (CDFs) produced, and the fluency and complexity of students' realizations of CDFs, using tools of Systemic Functional Linguistics. The results reveal similarities across contexts in the frequency and extension of some of the CDFs produced, and differences in terms of CDF complexity, measured in students' use of clause complexes, "Appraisal" resources and complex nominal groups to express different CDFs.