What is bdiffs in MRIQC DWI IQMs?

The MRIQC dwi report produces:
bdiffs_max
bdiffs_mean
bdiffs_median
bdiffs_min

The Read-the-Docs page describes a noise_b0 IQM: IQMs for diffusion images — mriqc 24.1.0.dev17+g207356d documentation

Are the bdiff values the same as the described noise_b0 IQM?

Thank you.