While this work has focused on two specific GC-rich sequences, the main features of DNA and RNA hydration dynamics (e.g., heterogeneity and location of fast or slower hydration sites, split of RNA phosphate hydration dynamics, nature of the slowest sites) have been linked to the overall shape of the double helix (A-form vs B-form) rather than to specific chemical features of the bases, so we expect all these observations to be similar in AT/Urich sequences. The main difference can be expected at slow sites at bases on the floor of the DNA minor groove, where we already see here a difference between GGGG and CGCG sequences. In addition, we know from previous work that AAAA-rich sequences have narrow minor grooves, where we expect much slower hydration dynamics. The dynamics in the grooves could be further sensitive to small changes in helical conformation, that can be experimentally modulated for instance by the background salt concentration and nature, and in simulations can depend on the force field used for water, nucleic acids and ions. Hydration dynamics at these sites and its sequence-dependence will be investigated in future work.