The following rules govern priority among conflicting security interests in the same letter-of-credit right:
1. A security interest held by a secured party having control of the letter-of-credit right under section 554.9107 has priority to the extent of its control over a conflicting security interest held by a secured party that does not have control.
2. Security interests perfected by control under section 554.9314 rank according to priority in time of obtaining control.