Forests and Hills are same classification?

In the game, they're separate terrains

Don't listen to Anony. he doesn't know much and comments are often empty.

For movement and terrain bonusses Hill and Forests almost have the same effects for every unit, but forests and hills make slight differences.

For instance:

Forests will give a strength bonus to Infantry; Hills not.

Hill wil give a bonus to Artillery; forests not.

Nevertheless ,(I think) every type of unit loses 25% speed (there might be an exception, which I do not know of from the top of my head)

Etc.