Unless the minis have been modified in some way then the icons are Ecclesiarchy ones (which look similar to Inquisition ones; see the current thread about this).
http://www.dakkadakka.com/dakkaforum/posts/list/427904.page
The
SoB minis didn't get changed icons in the comparatively brief time that they were officially the Ordo Hereticus' Chamber Militant (when C:
WH was valid) - they're mostly the same minis as they were back in 2nd Ed.
EDIT: Plus they were never exclusively an Inquisition Chamber Militant (as Deathwatch used to be, and
GKs are) but were more voluntary allies of the Ordo Hereticus, now and then, given similar aims, but were also their own organisation, able to act as they saw fit. So they most likely wouldn't have altered their icons at all when happening to serve with an Inquisitor.