Question

Is there any differences between Math.IEEERemainder(x,y) and x%y ?

Answer 1

No, they are not equivalent. MSDN shows the different formulas used for modulo and for IEEERemainder and has a short sample program exhibiting the differences:

IEEERemainder = dividend - (divisor * Math.Round(dividend / divisor))

Modulus = (Math.Abs(dividend) - (Math.Abs(divisor) * 
      (Math.Floor(Math.Abs(dividend) / Math.Abs(divisor))))) * 
      Math.Sign(dividend)

Some examples where they have different/identical output (taken from MSDN):

                         IEEERemainder              Modulus
   3 / 2 =                          -1                    1
   4 / 2 =                           0                    0
   10 / 3 =                          1                    1
   11 / 3 =                         -1                    2
   27 / 4 =                         -1                    3
   28 / 5 =                         -2                    3
   17.8 / 4 =                      1.8                  1.8
   17.8 / 4.1 =                    1.4                  1.4
   -16.3 / 4.1 =    0.0999999999999979                   -4
   17.8 / -4.1 =                   1.4                  1.4
   -17.8 / -4.1 =                 -1.4                 -1.4

See also this good answer by sixlettervariables on a similar question.