To re-attach the pull start cover to a Husqvarna K760 disc cutter, does it require 4 identical screws?

Yes, you need four of the same screws for the recoil on the K760. These are coming up as the screws you need: https://www.lsengineers.co.uk/screw-for-husqvarna-k760-501-98-10-20.html