The vignette of Queen Victoria is common to both stamps, but the diameter of the vignette oval for Large Queens is larger. The stamp size is thus larger. Additionally, the design and ornamentation surrounding the Large Queen vignette is more elaborate. Each value has a unique design.
The half-cent Large Queen is an exception, it is actually the same size as the Small Queen issue.
The album page on which your stamps are mounted shows both series.
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