They look exactly the same to me (except being for EQ1 and EQ2, so they will have different output motor speeds, because EQ1 has 96 and EQ2 has 100 teeth on worm gear).
Quote:
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Provides multi-speed quartz-controlled electronic motor tracking of the R.A. axis. Battery-powered.
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This doesn't make sense to me - quartz frequency can not be adjusted enough to be significant for this purpose...
But it all doesn't matter much really - your barn door reduction rate should be equivalent to EQ1 or EQ2 anyway.