I will be watching this post, as I recently bought a Viking Prelude 360 ... also from eBay!!!
I would think if the pre-wound Bobbins are Viking bobbins then you are good to go.
But what do I know?
I don't buy pre-wound.
I was specifically looking for a 2nd Viking machine as my other machine is Viking.
I think most of my "feet" are going to be interchangeable.
I hope you like your new machine!
I've tried mine out & I LOVE IT!!!