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This is the average H2 Fanboy.Xfire: JacobGRocks.50 in H2/H3? Great, but you still fail at this.
Is it possible to do system link between a xbox with no halo 2 title updates or title update 1.1 and a Xbox with title update 1.5?
From what I've heard, yes, the older version will get updated to match the new version.
E4web
Yes, this is perfectly possible. I asked this same question on the Xlink KAI forums many years ago and they said the updates aren't necessary, just the maps.