The function SameShape(name1,name2) returns true if the two tiles are of the same shape and SameSize(name1,name2) returns true if the two tiles are of the same size.

Switch to the world Two by Two and enter the following:

SameShape(b,c)
SameShape(a,b) - This is false
SameSize(b,c) and SameShape(b,c)

The Smaller and Larger functions can be used to test if one tile is a different size than another:

Smaller(a,b)
Larger(b,a)
Larger(b,c)

The last one is false because both tiles are the same size.

Tile Positions
Index