Manually move return of rome units to AOE2 DE

Age of Empires II: DE II - Modding
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I’m making mod reskin and making new civ for AOE2DE. I also want bring back the old units from return of rome unit to AOE2 DE as new civ. Can someone tell me how to manually doing that? I can’t figure out how to change the unit animation ID in ROR so they don’t overlap with AOE2 DE. Also I can’t find the json file or what file log the ID for each unit skin and animation. Any help on this would really appreciated.
Thank you everyone in advance.

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C:\Program Files (x86)\Steam\steamapps\common\AoE2DE\modes\Pompeii\resources_common