The one on the left is an APNG file.  If you can't see the animation, you're probably using any browser but Brave and Firefox.  That's too bad because you get real transparencies and more colours than you can shake a stick at.  GIF is on the right... but the dithered shadows looked terrible and the text became illegible so I removed both... of course the GIF version I've used has been around for 35 years now.  Wonder what Bitcoin will look like in another 20 years?