Suspension type forks are easily switched. I think the Ecotric Tornado is a typical mountain bike standard 1 -1/8" threadless model. They will come longer than your steerer tube and have to be cut down during the install.
This article compares the various Rockshox models.
Our essential guide to every RockShox suspension fork and the brand's key technologies
I knew nothing about forks when I did my first suspension fork conversion, and I ended up changing from threaded non suspension to threadless, and it was quite involved. Swapping a threaded fork is much easier.
There are all kinds of Chinese brand import forks for sale, including what Ecotric sells. Probably best if you want quality is to buy one with a US name like Rockshox. They're still probably made in China,