I doubt that the filename and title will always be the same, even after the conversion.
This is due to some illegal characters for filenames even though they do not cause any problems in the TITLE field.
Also, you may experience some strange (known but not unlogical) effects if the TITLE has a / or \ in it.
For example :
from FILENAME becomes ..
in TITLE tag [and the other way around]
Of course that required some thinking ahead from me and requires taking those "synonims" [exchangers] into account when adding new actions to my settings [so that for example my two dots will not interfere with three dots or titles with a single dot]
For FILENAME > TITLE way I use an action
For TITLE > FILENAME way I use the "Tag - Filename" icon