If I understand correctly, yes you can.

SELECT col1, col2, col3, ..., col160, NULL AS forecast_volume
FROM invoice_data
UNION
SELECT col1, col2, col3, ..., col5, forecast_volume
FROM forecast_data;

btw column order and data types in both tables must match

It is better for you to find a common field and join. If you can't, you can use union and cross join

If you want the table to be created in the following form, if it is empty in the equivalent of another table, we use union

SELECT invoice.Id,Name,family,t1,null DataS FROM invoice 
UNION ALL
SELECT null Id,null  Name,null  family,null t1, DataS FROM forecast

cross apply

But if you want it to be as below and the columns of two tables are multiplied together, use Cross apply

select invoice.Id,Name,family,t1,'' DataS from invoice 
cross apply( select * from forecast )a

Union all

Base Data:

1.invoice:
| Id | Name | family | T1 |
| ------------ | ------------ | ------------ | ------------ |
| 1 | aa | bb | 1 |
| 2 | asda | bdsdb | 3 |
| 3 | cc | tt | 12 |

2.forecast