The Classic and the SRV switches are similar in tones but have these differences.
Both switches have the same 16 treble bleed settings.
The Classic has 4 KingTone Switch settings and 1 treble bleed bypass setting.
The SRV has an extra KingTone Switch setting and the treble bleed circuit is always active.
The Classic has its 4 KingTone settings spread further apart than the SRV which has them focused around the SRV/Albert King type tones.