Does GURPS Time Travel have stuff that GURPS Infinite Worlds doesn't?

[Skarg]

I'm sure this has been asked before, but I tried to search for it and either got nothing or:

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 71 bytes) in /home/www/vbulletin/includes/class_core.php on line 3292

(for "GURPS Time Travel")

I see that IW is about twice as long and says it has material from TT, but IW is also apparently from the perspective that IW is a campaign setting, while it seems to me TT was about GM's making their own settings of any sort of time-travel or dimension-hopping. Or is that what the IW setting is?

Mainly I want to know, for someone who probably isn't going to use the IW setting itself, foes TT have any relevant material that IW does not? Does IW have generic material that TT does not?

Thanks!