is there any possibility of a price difference?
Yes.
Once wBTC depegged its price towards Bitcoin then we'll see the price difference from it. Just as how the other stable coins depegged from its based currency which is the US dollars.
There's a possibility that wBTC will be gone out of its price and that's why if you're wanting to hold it, just hold Bitcoin - the OG and the real one and not with these wrapped bitcoins.