Questions about welding the rear

I am currently in the middle of a spring over on my 72 FJ40 and have my front and rear axles apart. I have a EZ-locker or a Lock-Rite in the rear and open in the front. I am thinking about welding my rear and putting the locker up front. My cruiser is a daily driver when it is running. My first question is, how different is a welder rear and a full detriot locker. I have driven vehicles with detroits so I am interested in the difference between the to. Also can I just swap the front and rear thirds. I know the rear has c-clips and the front does not. Can they just be swapped. any help would be great.