Boost clock rate / Base Clock rate
memory clock rate.
The numbers (OC/Gaming/Silent) are modes the video card supports.
Ultimately you don't need to know what the numbers mean. You can see that the one is around 5% faster than the other. Meaning it is slightly more capable. For most users only 60fps matters since their monitors only run at 60hz. So the faster card can do close to 5% more work before it runs in to performance issues.
There are plenty of reviews where you can both read and watch the differences.