If you search using https://www.bing.com/search?q=VBMath+Rnd+Clone, you will probably find a sample class which pretends to be an exact replacement. To check this, call Randomize with the same parameters in both cases, then check if the generated pseudo-random sequences are the same.
What is the RNG algorithm for VBMath.Rnd
What is the random number generator algorithm used for VBMath.Rnd? Is it utilizing System.Random?