My understanding is the volts matter, but amps don’t as long as the charger is equal or greater than the amperage for which the device was designed. Both chargers are 5V, but the Ease is 100 mA while the Combi is 500 mA. Putting the Lumity (designed for 100 mA) in a 500 mA charger should work fine, because it will only take 100 mAs, and the extra is just excess charging capacity that doesn’t get used. Putting the Paradise or something designed for a 500 mA charger into a 100 mA charger might cause problems. At best, it will charge more slowly than it would in the proper charger. At worst, the charger might get fried and potentially damage the device.
Someone else please correct me if I’m wrong here!