Jonas, take a look at the bark. The bark difference is more evident than the leaf difference. Common buckthorn has a dark gray birch or Aspen like texture with a bit of an iridescent green to it, where the glossy has more of a ruff texture to it. I've never used glossy for a bow so I have no POV on durability, etc. What is interesting about your bow is that you have an good mix of sap and heartwood like yew so I hope it lasts forever for you.