u/Horror_East7301

I’ve been working on my 05 ninja 250, gas tank needs to be put back on. There are 2 screws that go into fairing and gas tank on each side, they look basically identical but was told the gas tank screws are shorter, and to be aware of puncturing it. I had them organized but they were messed up by a family member. I’ve tried measuring them but can’t tell from the eye. Only different i can tell is 2 of them have a green shade under the head, and the other 2 have a purple shade. Does anyone know what this means or have any other tips? I don’t want to puncture my gas tank