that’s not how that works.
you need to extract the pacs data from within the iclass SE. something you’re unable to do because the SE key is unknown. you can’t just copy the serial number you need the block data from within the tag which is the actual important info.
E2A: you could go the route of weaponising an SE reader to obtain the pacs or scavenge a HID SE capable SAM & work that into your reading