Hello @AleksandrMe
once you merge two tables, the trigger is the column name. So to avoid problems here you have to find a logic to rename your columns before merging. If you have a rigid structure you could create list of the new columns names then apply a RenameColumns-functions that is considering the old names and your new list and nename them.
Another approach could be to create a table with two columns (old and new) and use this information to rename the columns. When using this approach you probably have to filter the table that you use before applying the renaming (that the old-column contains only values that in the table to be renamed are in)
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Kudoes are nice too
Have fun
Jimmy
