the methods from ent/dip should work fine, just the precise file contents might cause errors, but they will most likely be missing lines that have been added to the entity for rebellion.

harpo

So with the new add-ons like the Titan , Corv , Cap. BattleShip2 and the new buffs + Abl I just make a copy and change them from techloy or techreb to RACE1. I have been looking at he Rebellion and the NEW RACE files in WinMerge and they seem for the most part alike. is there more that I'm missing or overlooking , or dose the above sound about right ? Again thanks for taking the time to read and reply to this.

You could make the loyalist TEC have some variants with advent plasma and vasari phase missiles, then add in a couple of "reverse engineering" research items that unlock those ships (heavy with plasma and long range with phase missiles come to mind) and also provide some damage/range bonuses at the same time. 

Make copies of the vessels, change around their weapons, make new research unlockers/bonusers, add the new entities to the entity.manifest, then add the new ships in place of the old ones in the tec loyalist entity file so you can build them.  Enjoy your work.  Doesn't do much, but it makes some sense that after so much fighting you'd figure out some of the enemy's technology.

notepad++ has a compare feature and highlights differences.