Connecting two PSU cables with different Amp/Voltage together? (PSU Cable extender, pics included)

I’m kinda crapping myself.
I bought a CH160 case that comes with a PSU cable that facilitates in closing the PC case (Images below).

Base PSU Cable (Black)

White Cable that comes with case with different A/V ratings than the Default PSU one

Connecting the two like this, and the black one to the wall socket

  1. AS you can see in the first image, the default PSU cable that comes with the Corsair bulges out making closing the top of the case impossible.

  2. The 2nd image (White cable) is what comes with the case that is an extension that plugs directly into the PSU and where you actually plug the actual PSU cable into > Into the wall socket.

AS you can see, I have not used it yet as the PC Case cable (WHITE) is rated at 12A and 125 Volts, whereas my Corsair Cable (BLACK) is at 10A and 250 Volts.

I live in Spain and France so the wall/outlet voltage is higher than the US where I believe the issue arises?

I have a Small form factor Corsair 750watt PSU The ‘SF’ version not the ‘CX’ version. I heard it has auto switching on, does this make it safe?

I’ve tried looking online and I’m getting a MIX of answers, AI isn’t any better either.
I just don’t want to risk frying my PC components if it isn’t a solid ”yes it’ safe”.

So If it isn’t safe at all, I guess I am stuck in just buying a new PC Case and saying goodbye to the CH160? Unless I can find a safe compatible PSU cable that is the same A/V that has the design from the white cable where the top PC case panel can close on it.

750 Watt PSU > 12A/125v in to PS > extends into the black cable rated at 10A/250V> That one plugs into the wall socket.

If you want more pics to get the idea clearly across feel free to demand it!