I have a big dataset that I need to append: Dataset1 and Dataset2.
I need to append Dataset2 from Dataset1.

Dataset1 only has the names in the firstrow (i.e. country1_2000, country1_2001,...country1_2020, country2_2000,...country2_2020,...)
Dataset2 has arbitrary variable names with the actual data (v1,v2,......)

I need to append Dataset2 to Dataset1 while keeping the variable names.

Is there a way to do this? Basically, I want the Stata to append exactly column by column.
For example column1 in Dataset2 to column1 in Dataset1.