Yeah, I suggest you to autoupgrade the units you want from the base unit ID, in this way the unit ID will be calculated the same, but the statistics can be changed at will.
Just a couples of things you must keep present in mind when you do this:
1. the new unit autoupgraded MUST have the same unit class of the original unit ID (for example upgrading an archer to another unit means that the new unit must be considered as archers by the AI, but then in the armor classes you can canghe it even to a infantry cavalry, building etc...
2. if the original unit (example the archer) has a single projectiles, then the autoupgraded unit became something like a chukonu, the new chukos will not shoot multiples arrows but just one, but this rule activates only on the already present on map archers, then, once you train new archer autoubgraded, all the new like-chuks unit sill be refreshed to get their fulli projectiles numbers
3. as well as berserkers hardcoded autoregen. can be passed throug via this method, just autoupgrade the berserker to whatever unit ID you want and it will get the autoregen. ability
hope this helps you Sir!
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MY GAME VERSION:
Age of Empires II The Conquerors 1.0 without any patches, just the ES release in August 24th 2000, proud to playing this game version![This message has been edited by AFFA the Cleric (edited 07-16-2020 @ 09:25 AM).]