Dear Feizbakhshi,
You haven’t provided much details on how you modeled the solution in ANSYS, why you expect differences compared to Modes/BModes, or how different the results are, but one possibility is that Modes/BModes are specifically tailored to predicting the mode shapes of centrifugally stiffened rotor blades (the natural frequencies of blades are impacted by the rotational speed, among other things).
A recent forum topic has briefly discussed the use of blade mass and stiffness adjustment factors for tuning to match known data: The differfence between FlStTunr and AdjEdSt. Yes, the adjustment factors affect the “whole simulation”.
Best regards,