The B+W Filter handbook (7 MB) lists the transmission diagrams of their filters. On page 61, 3rd row, 2nd column you'll find the yellow and orange filters. The Wratten 12 (minus blue), which bottoms out at 500 nm seems to fall in between the B+W 022 and 023. The roll-off area seems to be about 50nm for both the B+W as the Wratten 12 filter. There doesn't seem to be much mystery about it all. They're all just optical low-pass filters.