[HELP] Clone SSD not working

So I'm using Carbon Copy Cloner to clone my main disk where macOS is installed to a second SSD, so I have a safe boot copy and can mess around with SSD 1. My steps:

• Format the SSD 2 as Mac OS Extended (journaled)
• Clone SSD 1 to SSD 2 with Carbon Copy Cloner
• Start Clover EFI Bootloader to set up SSD 2 (using exact same settings as I did on SSD 1)
• Open mounted EFI, replace the complete folder with the EFI from SSD 1 (config.plist, kexts, etc.)
• In config.plist I only edit the Default Boot Volume to the same name as SSD 2 has
• Reboot (without SSD 1)

Problem now: In the Clover Bootloader I can't choose anything to boot from + the theme is different which I find quite strange as I literally copy pasted the EFI folder from SSD 1 to SSD 2.

What am I missing? I did this already once a few days ago using Multibeast to set up EFI on SSD 2 and that worked just fine, but I wanted to set up my hackintosh from scratch without using Unibeast/Multibeast.

Any help and advice is highly welcome!