I was doing some research and wanted to know if the replacement could be EPCQ4ASI8. Also is there part number for individual and reel versions?
Yes, you're right. The replacement for EPCS4 is EPCQ4A.
You may refer to EPCQ-A device Datasheet for more details:
And also, you may refer to Intel® FPGA Configuration Device Migration Guideline for more details in migration the device:
I hope this will help.