There's nothing stopping those addresses being part of another wallet. Two different seeds could absolutely generate the same address somewhere in their derivation paths, and indeed, since the number of all possible derivation paths is many orders of magnitude higher than the number of possible private keys, then it's certain that this is the case. But of course this will never happen simply because of the sheer size of the numbers we are dealing with.

But there are a limited number of addresses. It's just that we will never reach that limit.