Help with possible specular issue

Hi! S4S' preview only shows the mesh in its solid state, it doesn't show specular nor bump map. So you'll have to check in game for those.

As for the textures, no as they are. You can use them as a base, i recommend exporting the original textures of the S4 object and compare them to the ones from S3 to create the equivalent. The bump map has a specific shade of gray on both main and alpha channel. And the specular as well has different colors depending on the amount of shine, as well of a specific alpha channel.

The link you shared is incorrect, you shouldn't copy the address bar but use the "share" button that will give you the correct link of the file.