Of course they are different manufacturers and slightly different designs, so service kits are both expected to be different, but here's pics for visual comparison. Looks like both are "complete kits" (without doing an internal inventory of each).
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They both look like complete kits. I haven't rebuilt my regs yet, but I do rebuild a lot of pneumatic controls. Most often the price difference is, for instance, one kit will have a diaphram and one won't or the material of the parts are different. Of course in this instance you may just be paying for the name.....