Difference between Regression done in Excel and in AutoML in Power BI service

Hi,

I have two main questions regarding the AutoML features in Power BI Service:

1) What are the main differences between the regression done in Excel and in AutoML in Power BI service? I know the one done in Excel is linear (OLS) but what about the one done in AutoML, is it non-linear?

2) Is there anyway to extract/determine the regression equation (intercept and coefficients) from Power BI AutoML after the model is trained?