While both services share the same underlying technology—VS Code running on Linux—the move to GitHub introduced several shifts:
GitHub Codespaces initially defaults to the light GitHub theme, whereas the original service used the VS Code "Dark+" default. Visual Studio Codespaces is moving to GitHub
Because environments were not automatically transferred, developers had to manually move their work: Visual Studio Codespaces is moving to GitHub
The Visual Studio Codespaces portal was fully retired, and all remaining data was deleted. Major Differences and Improvements Visual Studio Codespaces is moving to GitHub
The service became read-only; users could no longer create new plans or codespaces.