Hi mate,

Yes. Working from memory differences are as follows.
Std 3dr roll bar is 14mm and mounts across the outside edges of trailing arms
2wd saph is 16mm - mounts on inner of trailing arms. Less width has got to be good for reduced flex etc thus better resisting roll.
4wd saph is 18mm i believe approx 1.5 times stiffer than 3dr 14mm
escos is 22mm and i believe 3/3.5 times stiffer than 3dr.

to my mind running with an arb allows lower springs rates softer damping. So you could for instance have it fairly soft at the back for good squat and launch but still have good roll resistance in the bends.

Some say running with no arb is fine.
personally i prefer a rear arb. I run the std 3dr one on my car. Thats with gaz golds and adjustable 6 degree rear beam. Seems to handle well to me.

I am a internet keyboard warrior and no expert. Dont flame me just my opinion.

in other news your old 200 mountune block is absolutely tip top and loving life in my 3dr. Goes well for a mild 360 i tell thee.