The comparison between $[v_{4,22}^{\pi^{\pm}} - v_{4,22}^{\rm p+\bar{p}}](p_{\rm T}) / v_{4,22}^{\rm h^{\pm}} $ and $[v_{4}^{\pi^{\pm}} - v_{4}^{\rm p+\bar{p}}](p_{\rm T}) / v_{4}^{\rm h^{\pm}} $ grouped into different centrality intervals of Pb--Pb collisions at \sNN. Statistical and systematic uncertainties are shown as bars and boxes, respectively.