template class constructor declaration followed by template parameters like classA<Type>(...)

Question

I have a legacy template class code which has been used for years. It has the following form for instance

template<typename Type>
class MyTemplateClass
{
    public:
        MyTemplateClass<Type>()
        {}
};

int main()
{
    MyTemplateClass<double> myclass;

}

I understand that the above expression is not valid any more from C++20 thanks to the [link][1]

What I want to know now is that what was the difference by writting

MyTemplateClass<Type>()

and

MyTemplateClass()

before c++20 since those two constructor declarations seem do the same thing.