I think the salient point is truly around changing your measuring device. I don’t think you need to insert a new test or make an adjustment to your FTP - the simple matter is the quarq will read differently from the kickr and you have exactly one FTP test completed on the quarq. Use that number and see how things are going in a week or two and then adjust or retest if necessary.
Don’t overreact because the number is different with a different measuring device. People often overreact and put themselves into a hole when a different power meter gives them a different (read: lower) FTP.
These same people don’t overreact when a different power meter gives them a higher FTP…human nature being what it is