T400CN vs. Black & White+

Kodak Black&White+ is supposed to be the "consumer version" of T400CN, modified to get better prints from the average minilab- presumably using color paper. Has any one done a comparison of these two to determine whether there is any difference in the resulting negatives? I don't really care about the prints - I consider them as "proof prints" from which real ones can be made. However, any differences in the negatives are important. Any input?

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