The old graphics has 3 versions, yes.
River I
River II
And there is a River in Big Box 5 (the one with 7th and 8th player) that we all refer to River 3 though it's not officially named that.
These river tiles are different in regards that some of them have elements for Sheep and Hills and, if I recall, other expansions as well.
These are easy to distinguish as they have 3 waves watermark on them.