Dimensionless identity experiments test the invariance of plasma physics to changes in the dimensional plasma parameters, e.g. ne and Te, when the dimensionless parameters are conserved [1] [2]. However, conditions at the plasma boundary, such as influx of neutral particles, may introduce additional physics. An isotope identity experiment was carried out in the JET tokamak with C wall (JET-C), in which ELMy H-modes were obtained with different hydrogenic isotopes, H and D, but with the same profiles of p*, v*, ß and q [3].