Priority of security interests created by new debtor.

(b) The other provisions of this part determine the priority among conflicting security interests in the same collateral perfected by filed financing statements described in subsection (a) of this section. However, if the security agreements to which a new debtor became bound as debtor were not entered into by the same original debtor, the conflicting security interests rank according to priority in time of the new debtor's having become bound.