Let F and G be generalized Hénon maps. We show that the Kato surfaces associated to the germs of F and G near infinity are biholomorphic if and only if F and G are conjugate in Aut `C2 ˘. This answers a question raised by Favre in the survey [5].

We also show that two generalized Hénon maps are conjugate near infinity, if and only if they are affinely conjugate.