Data from 949 children and adolescents with intellectual disability ages 5 to 16 for whom the Supports Intensity Scale-Children's Version-Catalan Translation was completed was used, in combination with data from the U.S. standardization sample, to examine measurement invariance and latent differences in the Catalonian sample. Results suggest that the same set of items can be used to measure support needs across U.S. and Catalonia samples and that there are age-related differences in support needs in the Catalonia sample, particularly between children ages 5 to 10 and 11 to 16 years of age. This differs from findings with the U.S. sample, where differences were found in a greater number of age cohorts. Implications for future research and practice are discussed.