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Explicit manufacturer interchange
Sterling Electric 206/2206AQ appears in the same manufacturer-published cross-reference row as Boston Gear F720B at Match installed ratio · 2.06 in center distance.
Sterling Electric explicitly marks the listed competitor models "Yes" for interchange with 206/2206AQ at 2.06 in center distance in its 2000RA Style AQ Interchange Guide. Rows marked No are intentionally excluded.
The manufacturer explicitly marks the compared model as an interchange in its published table.
Boston Gear F720B and Sterling Electric 206/2206AQ are tied by the published source at Match installed ratio · 2.06 in center distance.
Still verify the exact configured ratio, input/output interfaces, duty, accessories, and installation conditions.