OK, I sat down this morning to do a comparison on the difference in these 2 as Bridge P-ups. I am no tone expert my any stretch of the imagination, so the following is just what I haer personally. To make this comparison as fair as possible I used the 24 fret brazzy Collection against a 24 fret IRW CU24 with 2 pc Bridge. The CU24 does have an Ebony Board, but it was as close as I can get to be equal. I ran both Guitars through my Bogner Shiva, which is the Amp I am most familiar. What I found seemed rather strange to me, but maybe one of you guys have an explanation.
Humbucker mode: The mini 408 is not quite as bitey as the full size. Not sure this would be good for everyone, but it is for me. While both break up nicely with the volume dimed, the mini also does not break-up quite as much. There was not a huge difference, but I can hear it. I did not have to roll off the mini nearly as much to get it to clean up & the mini seems to be a bit more (ricky) jangly than the full size. I really like the mini at full Humbucking for my personal taste.
Single-coil mode: Oddly enough, I found the exact opposite to be true in the Single-coil mode The mini was noticeably more bitey than the full size. I had to roll back the volume farther on the mini to get it to clean up. I actually like the full size better in the single-coil mode. This all seemed rather strange to me. I switched back & forth continuously as it didn't make sense........... still doesn't!
I did not detect any significant drop off in volume between the 2 P-ups. I did not look up the output differences.........