The key difference is that a bottle 3D model is a specific 3D asset representing a bottle (object-focused), while a Blender 3D model refers to any 3D model created or edited using the Blender software (tool-focused).
A bottle 3D model is defined by its purpose—used for product visualization, packaging design, or games. A Blender 3D model is defined by the tool: Blender is a free 3D suite, so it can include bottles, characters, environments, or any other object.
You might find a bottle 3D model made in Blender, or use Blender yourself to create a custom bottle model.