Zola believes saving the penniless Hammers from relegation is just as difficult a task as what is expected at City.
He said: "Roberto has a tough job. He has a good team but he has a lot of pressure and it is a job that will test him very much.
"He has done very well in Italy and I am curious to see how he will handle it in the Premier League.
"My job is just as hard but in a different way. We have a different objective - we know we have to stay in the Premier League - but I don't mind that.
"I like things to be tough and I am sure this job will make me tougher."