Was the old chassis an Iveco Urbanway Chassis?

Yes, it's Heuliez GX 337 body based on Iveco Urbanway.

Ah, thanks.

Is there a difference between Heuliez GX 337 and Iveco Urbanway?

Heuliez is owned by Iveco, so as I understand it's just a locally built version of basic Iveco bus. Something like MAN Lion's Coach and Neoplan Tourliner.
Iveco offers one more model based on Urbanway, Iveco Crealis. It's also Urbanway with other design.

Thanks :)