http://ojzfy6mtnjkg4pbkf6fjnty22naczpek253skjm4crwftbohwgevbjyd.onion/alt/index.html
The only difference might be more in the realm of performance handling, but unless you're like a computer genius, that's not even relevant to you. Unreal gives you full access to the source code. If you're so smart you can decipher it and modify it to your heart's content.