Compare

OK. Did you try to iterate on the fields and compare them? Do you already have something and are stuck?

You should try this and replace the actual ri! with your record value or parameter.

a!localVariables(
  local!fields: a!keys(ri!mapData),
  reject(
    fn!isnull,
    a!forEach(
      items: local!fields,
      expression: a!localVariables(
        local!recVal: index(ri!recordData, fv!item, null),
        local!mapVal: index(ri!mapData, fv!item, null),
        if(
          and(
            not(a!isNullOrEmpty(local!recVal)),
            tostring(local!recVal) = tostring(local!mapVal)
          ),
          fv!item,
          null
        )
      )
    )
  )
)