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It is recommended to keep the resistors there. The resistors are used for proper termination, without them there can be impedance mismatch leading to signal reflections. If customer want to remove them, they will have to perform their own testing to check if this works for their application.
For DP83848K, yes they will be needed in RMII as well. For both MII and RMII, I would recommend starting with 33ohms and if that is showing problems then increase to 47ohms.
