Hello @Le18BR and welcome to the KNIME forum.
KNIME doesn’t have the function required in your description, as concatenate requires equal column names plus format type. But say so, it’s quite easy to assign the column names from your first table to the second prior to the row binding of the two tables.
‘Insert Column Header’ node can do the job. There are few recent examples on how it works, in the last week challenge “Just Knime It” Challenge 15
I hope this helps, but please ask for any clarification if further help is needed.
BR