Manufacturer functional interchange
Superior Gearbox B030 appears in the same manufacturer-published cross-reference row as Winsmith Old Style 913D at Match installed ratio/application · VarioDrive size 030.
Superior Gearbox publishes B030 (VarioDrive size 030, input shaft) as a competitor cross-reference target. Superior describes VarioDrive as functionally interchangeable with listed drives while requiring independent verification of ratings, dimensions, fit and application suitability.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
Winsmith Old Style 913D and Superior Gearbox B030 are tied by the published source at Match installed ratio/application · VarioDrive size 030.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.