You get the same rep changes by the same actions here as on other sites.
You can compare the help for the rep gains in on the various sites for that
unix&linux, tex, so
However how people vote is in my experience quite different between the various sites, and that might give the impression that U&L is more difficult.
Especially on newer sites like tex.se, and ebooks.se I noticed that you will more easily get a few up votes for an answer. Even when others answers are available. This might be because existing users are more concerned about people coming back there and thus want to encourage (I don't think that is a long term good strategy, but that is another discussion).
It can also be that, due to the topic, a site will have less (often) diverse good answers, that gives you less of a chance to gain rep if you answer with a working, but non-optimal answer. E.g. you give an answer here on U&L using
sed and then
Gilles, Stephane or slm someone comes with a better answer using
ksh only. Those simpler/better answers tend to get more up votes is my impression.
What certainly can be different between sites, is what levels of reputation gains you which privileges. E.g. on U&L you get access to the moderator tools at 10K, on ebooks this is at 2K. I lost some reviewing/voting privileges on tex.se at some point. I don't know whether that was because those rep levels were adjusted after getting out of Beta or enough users with higher rep were active.