That would be a pretty big grain, Comparisons like that are basically useless. Your YouTube is likely to be using H.264. H.265 and H.264 will be sharing much of

That would be a pretty big grain, Comparisons like that are basically useless. Your YouTube is likely to be using H.264. H.265 and H.264 will be sharing much of their encoding technologies, so they gain fewer encoding artefacts and loose less quality by taking a H.264 and re-encoding it as a H.265 than you would by taking a VP9 and re-encoding is as a H.264. The only real way is for someone to shoot raw video, and compress them both separately.