I can’t help you with Klipper, but the MCU clone seems to be common:
The motherboard of my SV04 also came with a GD32F303VET6 MCU, which is a clone of the ST32F103VET6 MCU judging by the datasheets linked here.
Compiling the Marlin firmware using settings for the ST32F103VET6 MCU results in a firmware working flawlessly on my SV04.