(a) Financing statement naming original debtor. Except as otherwise provided in this section, a filed financing statement naming an original debtor is effective to perfect a security interest in collateral in which a new debtor has or acquires rights to the extent that the financing statement would have been effective had the original debtor acquired rights in the collateral.
(b) Financing statement becoming seriously misleading. If the difference between the name of the original debtor and that of the new debtor causes a filed financing statement that is effective under subsection (a) of this section to be seriously misleading under section 9-506:
(1) The financing statement is effective to perfect a security interest in collateral acquired by the new debtor before, and within four months after, the new debtor becomes bound under section 9-203(d); and