SNIDs are unique numbers that identifies a specific laptop for registration / shipping and tracking purposes to retailers. It does not identify what model the laptop is.
Having said that, the Aspire series are consumer / value oriented laptops. Model with dedicated GPUs will be soldered into the motherboard. Laptops with upgradeable GPUs are basically limited to specific gaming laptop models that generally cost over $1,400 with high end GPUs. To repeat, specific gaming laptop models. There games laptops out there that costs over $2,000 with the dedicated high end GPU soldered into the motherboard.
If you want better gaming performance, then you need to buy a new laptop.