This is covered in the FAQ. Triangle was already in production when Timecrimes was released, and as you imply they not only have completely different plots, but they even belong to different "time-travel" sub-genres (Triangle is really about time loops rather than actual time travel and was inspired by the legend of Sisyphus, whereas Timecrimes is a "proper" time travel film, with an actual, working, time machine).
It's interesting that you say "Even the masks look very similar." A few people have claimed this, but in fact there is no mask at all in Timecrimes: Héctor is clearly shown wrapping a bloody bandage around is head. (Personally, I always wondered if this was a reference to The invisible Man...)
http://www.imdb.com/title/tt0480669/mediaviewer/rm3621426432
Christopher Smith has stated that the sackcloth mask in Triangle is a deliberate reference to Friday the 13th Part 2.
http://www.imdb.com/title/tt0082418/mediaviewer/rm1678646528
--
"So I've got bullets, but no gun. That's quite Zen."
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