See if that fridge has a wattage rating as well as the current draw. If it has a much higher wattage rating than the others, then it has a bigger motor as Commanda suggests.

If there is no starting capacitor it is either hi-tech and probably good, or just plain crude with resistance phase shift and just cheap and cheerful. In these days of concern over energy consumption I hope it hi-tech.

Careful use of power factor correction can be an advantage, but watch it with modified square (sine) wave inverters.