This is just a guess, but GSR probably stands for Grand Sport Rally or something similar. It's like the old school days of cars. Camaros had RS (Rally Sport) and SS (Super Sport) lines and Mustangs had LX, GT, GLX, GTS etc.
Like Silver said, their all just trim levels and don't have much to do with the engine (with few exceptions). One might have an extra couple suspension bits while another might have an extra 5-10hp, but for the most part it's all about interior and/or exterior option packages like gauge pods, upholstry, or wheels.
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