For your case nothing changed, use:
SELECT * FROM [C:\DB\DB1.mdb].qry_1
UNION ALL
SELECT * FROM [C:\DB\DB2.mdb].qry_2
UPD: To SUM them i would recommend GROUP BY. Let's say we saved upper query as qry_U then try smth like this:
SELECT [Name], SUM([Numbers]) FROM [qry_U] GROUP BY [Name]