In the case of Vero29s, they are the same line. Even maybe the same number of blue LEDs in the COBs. They are just wired up differently so circuit designers have three options. For example, I started with the high voltage COBs, but moved to the 50 volt ones so three in series would total 150 volts for my simple driver circuit. That uses no inductors and about $10 worth of parts for a 90% efficient driver.
You can look at my Drivers on the Cheap thread if you are into electronics stuff. Please be careful. If you have no electronics background, you should just go to HLG, Timber, RapidLED, etc, and buy some lights.