I do believe that the difference is as follows:
Reductio ad Absurdum is a valid argument in which you prove or disprove something by following logical conclusions until you find an absurd statement.
Ex.
Father: Why did you start smoking?
Daughter: All my friends were doing it.
Father: You're saying that if all your friends jumped off a cliff, you would do that too?
The father uses reductio ad absurdum by following the logical conclusion that the daughter will do anything her friends do, the result of this is of course absurd.
Reductio ad ridiculum however, is NOT a valid for of argument and just makes you sound uneducated if you use it. It is taking a statement to an extreme, however correct level as an attempt to discredit it, this however is unfair and does not actually challenge the argument.
EX
Borrowed from Wikipedia
If Einsteins theory of relativity were true then when I drive my car it would get more massive, now come on that's ridiculous! (This of course is true, although humans can't detect it)
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There is no difference.
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