The phonemic transcriptions of industry and industrial in the M-W dictionary suggests that the u is pronounced the same in both words: \ˈin-(ˌ)də-strē\ and \in-ˈdə-strē-əl\ both have a schwa following the \d\. This is rather strange.
Do you pronounce them the same? I think the stressed vowel in industrial is not a schwa, or a different kind of schwa.