Given that your vehicle can no longer be replaced like-for-like, we would expect the vehicle replacement company to source the closest thing to it in terms of specification and price. They may be able to accommodate a change in specification if you are prepared to make an additional payment, but this is something you would need to raise with them directly as soon as possible. There is also the possibility that their terms and conditions prohibit this, but it is worth enquiring to see if it is possible.