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Okay the explanation for what you had done was clear as mud until now.
When you swap parts and brands they will inevitably have different dimensions. Those miniscule differences in the gearbox dimensions can cause the differences in fps e.g. front of gearbox thickness where the hop up rubber sits, where the cylinder is seated relative to where the hop up mates with the gearbox, or even how thick the inside the gearbox is where the tappet plate pushes forward the nozzle. Definitely do not be surprised by this outcome.
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