Probably not. After years of trying everything to get a good match, I find for myself that the solar forecast integration this year is almost consistently half actual generated in summer and double actual in winter.
Solcast, on the other hand, is running at 90-105% actual to forecast, day after day.
Here is yesterday and today…
For yesterday:
forecast.solar, up to 09:00, gave a total forecast for the day ahead of 11.2
Solcast, at 02:00, gave a total forecast for the day of 16.1
The actual generated was 15.2, hence Solcast was 94%, and forecast.solar was 136% (actual/forecast).
I think that the figures speak for themselves.