This question can be interpreted in more than one way.
If you mean, scientist give more science than citizens working the land. It depends on how corrupt the city is and how much commerce the land gives in the first place.
What is said by Bartleby however, is that the scientist give more commerce worth of beakers than the taxmen gives commerce worth of gpt.
Whether adding science beakers from any source, be it scientist of more commerce, or whatever, enables you to reduce the SCI slider without increasing the number of turns it takes to complete research, simply depends on how much beakers the tech you are researching costs.