Made a mistake resizing icon

So I resized the Rocket Knight Customs icon for The Spriters Resource, but not The Models Resource icon. The image has transparent sides on both.

Is there any way to undo this? Also here's the pics:

  148779007090915.png (Size: 52.96 KB / Downloads: 2)

  rightupload.png (Size: 84.26 KB / Downloads: 3)

  wrongupload.png (Size: 69.6 KB / Downloads: 3)