first call data -> A B C D are added to the recyclerview
second call data -> A B C D E F
compare data from call 1 with call 2 and add E F because they are different

the final result to be shown in the recyclerview would be the following A B C D E F

mData.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, mData.size());
notifyDataSetChanged();
//this lines deletes the final button, and after add the new data
JSONArray res = response_json.getJSONArray("res");
for(int i=0;i<mData.size();i++){
    if(i >= row_index){ //row_index I identify the index of the page to update from it
        for(int j=0;j<res.length();j++){
            JSONObject item = res.getJSONObject(j);
            if(mData.get(i).getId() != item.getInt("id")){
                //add diferent data
                obj = new Obj();
                obj.setId_pedido(item.getInt("id"));
                obj.setValor(item.getString("valor"));
                mData.add(obj);
                notifyDataSetChanged();
            }
        }
    }
}
Obj mas = new Obj();
mas.setId_pedido(0);
mas.setValor("OBtener mas data");
mData.add(mas);
//Add the final button