Question about function type parameter type hints?

[Gary Willoughby]

class TypeHint
{
        public T method(T)() if (is(T == int))
        {
                return T.init;
        }
}
...

class TypeHint
{
        public T method(T : int)()
        {
                return T.init;
        }
}

...

Are the two above class declarations achieving the same thing? 
i.e. is the type hint of the second snippet shorthand for the 
first's 'if'? If so which is preferred?