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I don't know much about this but using the site below, would it be pertinent that it looks like a minor key, eg. Bbmin goes to minor chords of Ebmin/Fmin [iv/v] and the A# version goes up to E#min/E#min? This seems to be true of other similar comparisons.
Reference: http://www.guitar-chords.org.uk/chords-k...minor.html

I also found this:
http://www.transposechords.com/how-to-transpose-chords

Y'all probably know all of this, but sometimes a blind pig finds acorns...........