how to know which field connected to an optionset value group

Hi , I have 2 fields that are connected to the same optionset group, I was asked to change a value number and now I need to know which fields ( in the all system )are connected to the same optionset gourp, I need to know which fields are going to be effected from that change.
Is there a way to know how many or which fields are sharing the same optionSet group?