Manufacturer-published cross-reference
WorldWide Electric SMR6-15/1 appears in the same manufacturer-published cross-reference row as Hub City PT6307515 at 15:1 · AGMA size 307.
WorldWide Electric publishes this row in its SMR cross table, listing the WorldWide SMR model alongside competitor model numbers at the same published 15:1 cross-reference position. This preserves the manufacturer-published cross-reference claim without independently asserting that every listed competitor model is pairwise interchangeable.
The source and target appear in the same manufacturer-published cross-reference row.
Hub City PT6307515 and WorldWide Electric SMR6-15/1 are tied by the published source at 15:1 · AGMA size 307.
A cross-reference is a qualified replacement lead, not proof of a drop-in swap for every configured unit.