Same EFI folder boots fine on one drive with 10.14.4 not so on another

I had my latest hackintosh running fine for about a year Asus Rog Strix z370-i Intel 8700k Samsung EVO 960 .5TB nvme Replaced WiFi card for Broadcom Using 630 graphics over DisplayPort Using latest stable Lilu and WEG, clover 4920

When I upgraded to 10.14.4 a few months back it got a lot of graphics glitches basically what looks like massive flickering. After reading and searching a lot wasn’t able to find a fix. I am no particular pro, but have been running different hackintoshes for about 8 years. Eventually I got a new EVO 970, did a clean install following all my previous attempts, and everything works fine on that drive. I copy over the EFI folder to the old drive and boot, and the graphic issues persist. Even the /library/Extensions folder is identical.

Any ideas what I should tweak to fix the original install.

Sorry I haven’t posted the usual files, I of course can, but I believe the issue is not related to EFI

Thanks.