The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
On the other hand, Mother Talzin is a character from Star Wars: The Clone Wars, she is a Dathomirian witch and leader of the Nightsisters clan. She has magical abilities, such as the ability to communicate with the dead and create creatures through magic. She also has advanced combat skills, but lacks as much power and experience as Lord Voldemort.
In short, Lord Voldemort has a significant advantage over Mother Talzin due to her wide range of magical abilities and combat experience. Lord Voldemort is more powerful and experienced than Mother Talzin and would be more likely to win.