When you click on them in here, they don't just look the same.
They are the same.
UBB actually creates a link with the parsed version.
You shouldn't URL encode the whole querystring.
You should URL encode the parts of the querystring and then paste them together with the control characters (& and ?) as your separators.
If you url encode the whole
string, the encoder will escape the control character which stops them from being control characters.