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We estimate chemical freeze-out parameters in HRG and EVHRG model by fittingthe experimental information of net-proton and net-charge fluctuations measuredin Au + Au collisions by the STAR collaboration at RHIC. We observe thatchemical freeze-out parameters obtained from lower and higher orderfluctuations are though almost same for $\sqrt{s_{NN}} > 27$ GeV, tend todeviate from each other at lower $\sqrt{s_{NN}}$. Moreover, these separationsincrease with decrease of $\sqrt{s_{NN}}$ and for a fixed $\sqrt{s_{NN}}$increase towards central collisions. Furthermore, we observe an approximatescaling behaviour of $(\mu_B/T)/(\mu_B/T)_{central}$ with$(N_{part})/(N_{part})_{central}$ for the parameters estimated from lower orderfluctuations for 11.5 GeV $\le \sqrt{s_{NN}} \le$ 200 GeV. Scaling is violatedfor the parameters estimated from higher order fluctuations for $\sqrt{s_{NN}}=11.5$ and 19.6 GeV. It is observed that the chemical freeze-out parameter,which can describe $\sigma^2/M$ of net-proton very well in all energies andcentralities, can not describe the $s\sigma$ equally well and vice versa.

Centrality dependence of chemical freeze-out parameters from net-proton and net-charge fluctuations using hadron resonance gas model