Wouldn't it work just to set the threshold higher?
It depends on what you mean by matching. If you want the exact same signal, you could just take the residuals of reference signal and the candidate signal and check if the max(abs()) value is less than some tolerance level.
For example:
res = abs(refWave-candidateWave);
if max(res) > 10*eps
fprintf('These two waves do not match according to the criteria.\n')
end
