When under Spanish ownership, GasGas was never known as a motocross brand. However, under the guidance of Pierer Mobility AG and Bajaj Auto—the owners of KTM—that’s about to change. There will be three GasGas motocross bikes for 2021—a 125cc two-stroke, plus 250cc and 450cc four-strokes.

As far as we can tell, the GasGas MC models are the same as their KTM counterparts, with one significant exception. The GasGas MC MX racers will have Maxxis Maxxcross MX-ST tires, rather than Dunlop Geomax MX33 rubber.
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https://ultimatemotorcycling.com/2020/09/25/2021-gasgas-motocross-lineup-first-look-specs-and-photos/