1. many companies charge for student versions. Not all, but many do, and at a reduced rate.
2. many companies change their UI or rework icons to reflect changes in the industry or to refresh their product. Apple, Microsoft, Adobe, SideFX, Blackmagic, Autodesk and even the beloved Blender have changed their UIs at some point in their existence to refresh their product. It's a simple fact of life that most of us that have been around the industry more than 5 years would recognize.
Subsequently, Command-C still works to find commands in C4D. That hasn't changed. Also, if you tried really really really hard, you'd find tutorials that explain the changes that happened into R25. Lastly, any person with any sort of analytical ability will be able to find where the changes in the UI were made and where the new icons rest. Grasping at straws when you don't need to...
This is a fruitless conversation.