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[Ranika]

Even if they had taken steppe horses, they would've done so thousands of years earlier, so the breeds would alter over time. So, Germanic/Gallic horses would not be similar to steppe horses, they would look different, from grooming habits, diet, etc. So, they would raise their own horses, not bring in steppe horses (except for some ponies and a as 'exotic' gifts for njobles). While they possibly originated from a similar strain, the horses would be different by 270 BC. Germans probably imported more steppe than Gauls, who possibly had some large horsebreeding operations (probably tied to Epona worship).