This is one and the same CPU.
Internally (hard-coded into the CPU by AMD) the CPU is called "AMD Ryzen 7 3700U with Radeon Vega Mobile Gfx".
But the BIOS changes the CPU name to "3750H" in CPUID, which is displayed by most tools.
HWiNFO reports the internal hard-coded name to avoid possible fakes.
If you don't believe, then compare the OPN number (which is unique for each model) in official specifications:
Nope, that's completely fine then just a lack of my knowledge , and I know this will be going a little bit off topic , but maybe you will know HWiNFO doesn't seem to show no "Performance limit - xxxx" on CPU , only on GPU , is it just HWiNFO doesn't support on this CPU , or some other reason ? Big thanks !