The song also changes as well, or, at least the lyrics do, as it's part of the same song. the difference being that it's the second half of it.
A few of the visuals also changed as you pointed out, but, it wasn't to show less of Kurisu, as, she appears in it the same amount as the other opening. The visuals change by showing a quick glimpse of the destroyed city that happens from world war 3 and also shows the other characters more.
Zafree
2018-08-17 06:10:20 +0000 UTC
He said he had to go about it a different way. Convince his past self that she's dead while making sure she isn't actually dead. Trick yourself.
Ian Kirk
2018-08-16 02:25:42 +0000 UTC
And the intro did change, but only the visuals. I think its because they came back to the original timeline so Kurisu wasn't shown that much in the intro. Unless im wrong then never mind lool