Any Difference in GroupBy and OrderBy Using Numerals

 Hi Folks

is there any difference in using numerals for ordering  as opposed to using the names for grouping by or ordering by clauses ?

example 1:

select
   name,
   TO_CHAR (empdate,'yyyy') yeartodate,
from
   table1
group by
   name,
   TO_CHAR (empdate,'yyyy')
order by
   name,
   TO_CHAR (empdate,'yyyy')

example 2:

select
   name,
   TO_CHAR (empdate,'yyyy') yeartodate,
from
   table1
group by
   1,
   2
order by
   1,
   2