The models have different grids and time steps (GFS every 1–3 h, ECMWF every 1–6 h, ICON every 3 h) — some differences come from the method, not the forecast.
Data: GFS: NOAA GFS (AWS Open Data)ECMWF IFS 0.125°: © ECMWF, CC BY 4.0, source www.ecmwf.int · via Open-MeteoICON: Datenbasis: Deutscher Wetterdienst (CC BY 4.0)