Cropping in Wwise is a process executed during conversion of audio file. Only the audible portion of the cropped sound will actually be converted and placed in Soundbank. For that reason, each cropped version of the same file will generate a different media file.
However, pitching is a runtime process, and creating a copy of a sound and affecting the pitch will not generate a different media file.
The best way to verify the number media file left is by generating the sound banks and looking at the message:
19:38:50 - Evaluation mode: SoundBanks contain 1 media item(s) out of the 200 permitted. Windows®