To get the same FOV you should indeed select the same FOV Type and FOV value as the game you are converting from, and check the output for the Config FOV you need to set to match this.
So in your case you can do like this, where your config FOV in MW would be 116.91. As for the conversion setup I have set it to match the 3X, 4X and 5X to your 43 here, so it uses this scaling for MW.
https://www.mouse-sensitivity.com/?share=b8ad34c030e00cba9fa35e160b1fe225