Difference between 11x3.50-6 and 4.10/3.50-6

#1
So just looking at these tires on ebay I can't notice a significant difference between them. Are they both interchangable on a 6 inch rim. I currently have 4.10/3.50-6 on my 6 inch rim. Will the 11x3.50-6 fit?
 
#2
hard to figure between the different calculations..all I got..hope helps..personally I try to stay with a tire that has like calculations to be safe..even if a little more $$ for tire..also 2 ply softer sidewall than 4 ply...depends on personal choice..
 
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