Please bear with this new user.
Using both the "original mask" and "new filename pattern" suggested (above) yields no opportunity to finish the Filename--Filename conversion (see attached image Mp3Tag_A)
Did try putting the "\%4" at the end of the original mask. Conversion was accomplished but what was pulled in to the beginning of the filename was the Title (see attached image Mp3Tag_B)
FWIW - Should mention that the submitted images all depict the filenames of tracks 1 & 2 converted my "old" way. Track 3 is the first that hopefully could be converted with the disk id pulled in to the beginning of the filename.