Merging Additional Columns from Table 2 into Table 1 Efficiently

Hello, I have 2 tables In one table, I have used some credits to add data to one column In the other table (it is the same extract of the first table, but with additional columns) The only difference is that in Table 1 there are 770 rows, and in table 2 there are 771 rows. How can I push the 2 additional columns from Table 2 into Table 1 (where I have used credits) while keeping in mind the difference of one row?