Pandas - Getting just the columns that changed between comparison

Question

I have a post-outer-merge Dataframe where there's a column with the indicator (left_only, right_only) that differs a row from another.

But I want only the columns that changed, not all the row. I'm filtering just by left_only, but i just need the columns that effectively changed and the column ID needs to be "locked" there, is the only one that can't get removed when i filter just the ones that changed.

For example:

ID	Manufacturer	TAG	ID2	_merge
10003	Apple	334	999	left_only
10003	Samsung	223	999	right_only
10004	Samsung	253	567	left_only
10004	Samsung	253	999	right_only

The output should be:

ID	Manufacturer	TAG	ID2
10003	Apple	334	999
10004			567

And just for the record, I'm doing the merge like this:

df_final = (pd.merge(
   df, df2, how='outer', 
   indicator=True)
   ).query('_merge != "both"')