Querying Table2 With Results From Table1 And Displaying Data From Both Tables

I need help in writing a query.

The query should get top 10 items and their values from current year and the values for the same items from previous year table.

I was able to write the code for 1st part that gets values from 1st table but I don't know how to get the values from 2nd table.

The 2 tables does not have any primary/foreign key relations. Both tables have same structure and same columns.

I am attaching some images below to give more information.

Image of results from my query.

Image of how the final output should look like.

The Store Procedure code is:

ALTER Procedure [dbo].[free_customsHS4](
@TblName1 varchar(20),
@TblType varchar(20),
@District varchar(6),
@Month varchar(3)
)


AS
Begin
SET NOCOUNT ON;

Declare @SQuery nvarchar(3000)
set @TblName1 = '[' + @TblName1 + ']'
set @TblType = '[' + @TblType + ']'


SELECT @SQuery = 'select top 10 a.commodity1 as HS4, b.descrip_1 as Description,
sum(a.all_val_mo) as [Amount],

(sum(a.all_val_mo)/(select Sum(a.all_val_mo) FROM ' + @TblName1 + 'a
where a.stat_month <=' + @Month + ' and a.district=' + @District +'))*100 as [% Share]

FROM ' + @TblName1 + ' a left outer join ' + @TblType + ' b on a.commodity1=b.commodity1
where a.stat_month <=' + @Month + ' and a.district=' + @District +'
Group by a.commodity1, b.descrip_1
order by [Amount] desc'

EXEC sp_executesql @SQuery
END