Q: Are the graphs of the polar equation in the form of r=a+bsinө and r= a-bsinө different in any way?
A: Why not try it out on your calculator? This is a very easy question to answer on your own. r=a+bsinθ and r=a-bsinθ are basically the same shape. As you can see from the picture below, one is a reflection of the other over the x-axis/polar axis. The blue graph is r = 3+4sinθ and the reddish graph is r = 3-4sinθ.
In case you were wondering, the values of a and b in the equation r=a±bsinθ or r=a±bcosθ affect the shape of the graph. This diagram summarizes how limacons (w/inner loop, dimpled or convex) differ from cardioids.