All you need is to make sure you have the exact same possible values across the two tables. If you replace all the 1-digit group values from both tables with numbers starting with 5 then you could achieve that, as long as you don’t introduce another space character in front of 5 in one of the two tables
The other solution would be to open the study table in a text editor (for example, the editor on the farm) and delete the space character in front of all the 1-digit group values
Jeremy