In the four words you're asking about, the verb forms put the stress on the second syllable, and the noun forms stress the first syllable. Let me use boldface/rom type and caps/lc to show you what I mean. The stressed syllables are capitalized and printed in boldface type:
verbs: conDUCT and proDUCE
nouns: CONduct and PROduce
Webster's dictionary labels stressed syllables with a '. So the phonetic spelling of the noun form is \ˈkän-(ˌ)dəkt\. The phonetic spelling of the verb is \kən-ˈdəkt. You can listen to the pronunciation of each word at the web site link in the sources section.