those are both edible nannas. see the white powdery stuff under the leaves and near the top of the stem, basjoos don't get that.
basjoo sward pups
Google Image Result for http://vicpic.cybersites.ca/July05/M_basjoo_July05.jpg
here is a picture of my orinoco from last year. looks very similar to the bottom pic.
Hope it flowers soon and you will really be able to tell.