Yes, that is a big difference. The Noa is MUCH weaker than the Tiani.
The Tiani also comes with the remote control and the Noa doesn't. The Noa will work with the Tiani's remote control, and when you use it with the remote it is quite a bit stronger (it goes from 2 vrooms up to 3 vrooms) - but to have the remote control you'd have to buy the Tiani first.
The Tiani also comes with 2 different attachments, while the Noa only has 1.