No your GitHub Enterprise Server instance, navegue até a página principal do repositório.
À direita da lista de arquivos, clique em Versões.
Next to the release you want to use as your base, click Compare.
Use the "Compare" drop-down menu and select the tags you want to compare.
You can compare release tags to see changes to your repository between different releases.
Who can use this feature
People with read access to a repository can view and compare releases.