In a two-tone SSB test, the tones used should be

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In a two-tone SSB test, we’re checking how the modulation path handles two independent audio signals and how nonlinearities show up in the transmitted spectrum. Both tones must lie within the modulation bandwidth so any distortion products appear inside the transmitted signal for measurement. The tones should be non-harmonically related to avoid a simple, predictable set of intermodulation products that line up as harmonics; this spreads the distortion across the band and gives a more realistic picture of linearity and IMD. Using two identical tones wouldn’t test two separate inputs, a single tone with an overtone isn’t a true two-tone test, and harmonically related tones would produce a predictable harmonic structure that can mask certain nonlinear behaviors. So two non-harmonically related tones within the modulation band is the proper approach.