difference between load1 and broadcast intrinsics

What's the difference between _mm_broadcast_ss() and _mm_load_ps1()?

void example(){
   __declspec(align(32)) const float num = 20;

   __m128 a1 = _mm_broadcast_ss(&num); 
   __declspec(align(32)) float f1[4];
   _mm_store_ps (f1, a1);
   std::cout << f1[0] << " " << f1[1] <<" " << f1[2] << " " << f1[3] << "\n";

   __m128 a2 = _mm_load_ps1(&num); 
   __declspec(align(32)) float f2[4];
   _mm_store_ps (f2, a2);
    std::cout << f2[0] << " " << f2[1] <<" " << f2[2] << " " << f2[3] << "\n";
}

I got same output in both ways, so why do they both exist?