[Top Jimmy]

It's tricky but it can be done. Assuming these are wav files, export the files from MC again at 24-bit and stash these in a folder. With the appropriate session open in PT, go to File>Save Copy In selecting 24-bit and choose to copy all of the audio files as wav. Once the session has been copied along with all of the wav files, quit PT. Now go through the audio files folder in the copied session and rename the 24 bit files in the folder from MC so that the same files have identical names. Now trash all of the files from the audio files folder replacing them with the renamed files from MC. When you open the copied PT session, you will get a file relink pop-up. Choose to relink manually and then find by file name only. When the links appear in the relink window, commit them and get on with your production.

If the wav files directly from MC are not interchangeable with PT wav files, an intermediate step is required to make them so. Create a new 24-bit PT session and import the files from MC. Now you can use the files from the audio files folder of this new session to drop into the converted one.