Generally speaking, no.  If the history is different between Novosibirsk and Almaty (as we have), then we retain both zones for historical conversion purposes.

If the data we have is wrong, that's another matter.  We currently have Novosibirsk as observing UTC+7 year-round since March 2011.  If they switched back to UTC+6, do you know when they did so, or have any news reports documenting the change?