Will ANSI JOIN vs. non-ANSI JOIN queries perform differently?

I have my business-logic in ~7000 lines of T-SQL stored procedures, and most of them has next JOIN syntax:

SELECT A.A, B.B, C.C
FROM aaa AS A, bbb AS B, ccc AS C
WHERE
    A.B = B.ID
AND B.C = C.ID
AND C.ID = @param

Will I get performance growth if I will replace such query with this:

SELECT A.A, B.B, C.C
FROM aaa AS A
JOIN bbb AS B
   ON A.B = B.ID
JOIN ccc AS C
   ON B.C = C.ID
   AND C.ID = @param

Or they are the same?