Hi Jarrad and welcome to the FISD.
Have you had a look at the Film Canon CRL's , this is where you will find the differences between the armour from movie to movie.
These CRL's are one of your main points of reference. Secondly, check out the Photo references tab. These are shots of the real costumes used in the movies, including screen grabs from Blu Ray..
CFO is the only RoTJ armour maker, most others can be modified and assembled to suit any of the other versions Hero, Stunt from ANH or ESB.
This hobby requires the research and this sight is loaded with all the info.
Do you know where your armour kit is coming from (maker)?