I have both sets, but unfortunately they are in storage at my mom's house and I can't check immediately. However, here is what I remember from them: the baby buggy one was lighter pink in color, and had a longer 'stem' than the Paradise Estate umbrella table one had. Probably because the buggy one was supposed to have a ribbon tied on it. But the PE one was definitely more of a darker pink. I'm thinking this is the one you have here. They are interchangeable as far as function; I remember this because my sister and I each had one of the buggies, and she lost her heart topper. I used to lend her the PE one for her buggy when we wanted to play with the 2 buggies together. I will check to confirm and take pics of them together when I can.
You are so very lucky to have found these! It is a hard piece to find if you are looking for one, believe me. I have my sister's buggy in my possession now, and it took me forever to find a new heart topper to complete hers. Nobody ever just sells it separately. I think I ended up paying like $40-ish for a big lot of other pony clothes, accessories and junk that I mostly already had just to get it.