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So the new Imperial Knights has a "Rotate Ion Shield" stratagem that is 1 CP to add +1 to the invuln save to an Armiger or Questor class knight and 3 CP for a Dominus class knight

The Adeptus Mechanicus has a "Rotate Ion Shield" Stratagem that is 1 CP to add =1 to the Invuln save of any "Questor Mechanicus" knight, no size/model restriction.

Does the new one overrule the one in the older codex, can they be used as subsitutes/at the same time?

From the Rulebook FAQ:

Q: For the purposes of the Strategic Discipline matched play rule, are Stratagems with identical names that appear in different codexes (e.g. ‘Veterans of the Long War’, which is a Stratagem in Codex: Chaos Space Marines, Codex: Death Guard and Codex: Thousand Sons) considered to be the same Stratagem?
A: Yes.

 WrentheFaceless wrote:
So the new Imperial Knights has a "Rotate Ion Shield" stratagem that is 1 CP to add +1 to the invuln save to an Armiger or Questor class knight and 3 CP for a Dominus class knight

The Adeptus Mechanicus has a "Rotate Ion Shield" Stratagem that is 1 CP to add =1 to the Invuln save of any "Questor Mechanicus" knight, no size/model restriction.

Does the new one overrule the one in the older codex, can they be used as subsitutes/at the same time?

Rulebook FAQ

Q: For the purposes of the Strategic Discipline matched play rule, are Stratagems with identical names that appear in different codexes (e.g. ‘Veterans of the Long War’, which is a Stratagem in Codex: Chaos Space Marines, Codex: Death Guard and Codex: Thousand Sons) considered to be the same Stratagem?
A: Yes.

So they can't both be used, but you can use either assuming you have unlocked both. GW might errata the old one in the future though, but until then it's fair game.

Thanks, didnt realize there was a FAQ that addressed that already.