Cerebral venous oxygenation (Yv) is an important physiological parameter and has potential clinical application in many diseases. T2-relaxation-under-spin-tagging (TRUST) is a commonly used MRI method to measure Yv. Harmonization of TRUST across MRI vendors is important for dissemination and multi-center studies of brain oxygenation as a disease biomarker. In this work, we harmonized TRUST pulse sequence components and imaging parameters across two major MRI vendors, Philips and Siemens. We showed that Yv measured on the two vendors were highly compatible and strongly correlated, had excellent reproducibility, and can reliably detect oxygenation changes associated with physiological challenges on both scanners.