The main difference is going to be the thickness. From what I see of online specifications for the wallpaper it is about 3/32" thick. If you use 1/4" beadboard plywood that will be more than double the thickness. The beadboard we mill for our shutters and doors is 1/2" thick.
So if you have them side by side the thickness will be very noticeable. This also means that the detail in the beadboard wallpaper is not going to be as defined, or look as deep, as it will in the plywood or real beadboard.
If you have them side by side I think the difference is going to be a bit extreme. However, if it is just in the same room it may not be as noticeable.
Your best bet is to get a sample swatch of the beadboard wallpaper, take it home, and see how it looks compared to the wood beadboard.
I hope this helps!