Yes it can be done but if you end up using less points the ones you borrowed cannot be put back into the 2009 year. If you used a combination of points make sure they use the borrowed ones first and then if you are within your banking deadline for the 2008 ones you can bank them if you don't have other plans for them. If the resorts are equal in points obviously it would all just work out. If if cost more points, then you would have to borrow more if you have them to borrow.