IV probit and Ivreg


When I use ivreg in Stata and cluster standard errors my results show that the independent variable is significant. However, when I use ivprobit (which makes more sense, as my dependent variable is a response variable that can only take on either the value 1 or 0) the independent variable is not significant anymore. Does anyone have an idea why the results are so different when using ivreg vs. ivprobit? Shouldn't they produce the same results (at least in terms of significance)?

Thank you in advance,
Best Carmen