You can win on Sid without the GL, but I have only done it once. That is mainly because it is not hard to get the GL, unless you do not start with alpha.
I have gotten the GL when I was not the first to philo, because the AI will not go on to Lit at this point. Now I am talking about island maps here. In contients, it is much harder to get the free tech or the GL.
I have not played much on pangea as it is way too much agony for me, but I would not expect to get it there and would have to hope it was some place that it could be captured while I avoided Education. This is no mean feat. More likely you will either die or capture it after it is obsolete.