We study deviations between MSSM and NMSSM in the predictions of $Delta F=2$ processes. We found that there can be two sources which can cause such deviations, emph{i.e}, due to certain neutralino-gluino cross box diagrams and due to well known double penguin diagrams. Both are effective at large $tan beta$. In addition to this, taking into account 8 TeV direct search constraints from the heavy Higgs searches, we study the maximum allowed MFV like new physics (NP) effects on $Delta M_s$ in the two models. In NMSSM such NP effects can be as large as $25 %$, on the other hand in MSSM such large contributions are severely constrained.
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