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RAW, yes, for a stupid reason. The Elysain list says "see Codex:IG", which means that you have the exact same rules as C:IG officers. That is, you can give orders to friendly units chosen from C:IG. So your Elysians can give orders to allied IG squads, but not to other Elysian units. Needless to say this is stupid.
RAI, no. The intent of the C:IG errata is that you can't give orders to allied units (or use allied IC leadership for orders, allied ICs in your units can't benefit from them, etc), so the RAI answer would be that Elysians can give orders to other Elysians but not any allied armies (and of course C:IG squads can't give orders to Elysians).
Rules-as-fluffy, yes. They're both IG regiments even if they're chosen from separate lists for rules purposes, and IG officers clearly have no problems with giving orders to units from other regiments (a Cadian CCS giving orders to Catachan veterans, for example). In a casual game you might be able to convince your opponent to allow you to give orders between the two armies.
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