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GT350 vs S550 Rear Lower Control Arms

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First, I love this forum. There are a lot of smart people here and I love the knowledge being shared.
I know that the guys a Vorshlag did some testing of GT350 springs, comparing the Track Pack springs to the GT350R and in that comparison they found that the left rear GT350 spring would actually fit both sides of the standard S550. Has anyone looked into those arms further to see what else besides the coil pocket is different? I have a set of the base GT350 monotube dampers and I was going to install them with the Ford Performance sway bars and springs. Wondering if Ford gave the left GT350 control arm a different bushing than the S550 and that is why the part number is different. In other words same arm different bushings.
 

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