Firefox on iPhone is Firefox on iPhone, but it uses WebKit instead of Gecko.
Chrome on iPhone is Chrome on iPhone, but it uses WebKit instead of Blink.
The reason this is important for you to keep in mind is because Firefox is whatever Mozilla says Firefox is, and Chrome is whatever Google says Chrome is. There's no reason to suppose the iPhone version of some product should share any code with the Android version of the same product.
Chrome on iPhone is Chrome on iPhone, but it uses WebKit instead of Blink.
The reason this is important for you to keep in mind is because Firefox is whatever Mozilla says Firefox is, and Chrome is whatever Google says Chrome is. There's no reason to suppose the iPhone version of some product should share any code with the Android version of the same product.