It can be done. It is for the employee to object to the changes if he feels he is prejudiced and the Presiding Officer must then decide on whether there are, in fact, prejudice.
If I can draw a comparison with criminal law, even there it is allowed to find an accused guilty of any other offence that he has not been charged with, but that is in the same sort of 'family' that he has been charged with if all the evidents of the lesser crime has been proved. For instance, where an accused was charged with murder, but the State cannot prove intent, but instead proves negligence, then the accused can be found guilty of culpable homocide despite not being charged with it.
So, yes, unless the employee raised a valid objection and it was ignored by the presiding officer, it is allowed and procedural.
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