As a sound designer in a previous life, I've used sound from sound banks that I had purchased (like Ric Vier's Sound Effects Library, or the Hanna-Barbera Sound Effects Library, or any of the Sound Ideas sound effects). They are sounds that, once purchased, are royalty free and can be used for commercial products following the specific licence purchased.
Having used those sounds quite a bit, I ended up actually recognising them in a lot of other movies and games. For example, I know I have used the metal sound of the tourniquet in the scene where Harry Potter first sees Padfoot in The Prisoner of Askaban. I have also heard that exact same sound somewhere in "The lords of the Ring", if I remember correctly, and a few other movies.
From what I have gathered, if the sound that was creted for you comes from one of those libraries, and the proper licencing has been respected, then it should be fine. The sound designer for Spyro 2 probably did the same.
In the end, there are only so many ways coins clattering to the floor can sound. Unless you are using a specific iconic sound (like Darth Vader's breathing, or R2D2's bips etc...), then from my understanding, you should be fine. Please note that I only give my thoughts as a former sound designer, and I haven't studied the laws around that.
Additionally, since it can be quite easy to tweak the sound just a bit to ensure it is actually different, I'd opt for the safer approach, and more creative and original approach, of making the sound as unique as possible.