In most cases the current ratings of a name brand charger can be exceeded for short periods without harm, and for a camera the current peaks are for a few seconds to charge for electric flash, and then the power draw is typically very low, with the odd peaks when taking images or writing to flash memory. This one draws 220mA, so likely will run on the LG charger no problem.
The problem comes with no name knock off chargers, which often are unable to meet the specified power draw for more than a second or two, if they can actually meet them at all. Basically if the case is incredibly small for the ratings, or it runs hot enough to be uncomfortable to hold for more than 10 seconds, it is being overdriven, and will fail in short order, plus it is not likely to meet any sort of standards approval regarding insulation stand off voltage, creepage and clearance internally, and is likely using sub standard components being operated at or beyond the maximum rating, so giving a short life before they fail, and then you hope the failure is not going to destroy the equipment plugged in to it, or injure the user.