No conservative or reform convert intends to accept the 613 mitzvos, thus they are all invalid. No conservative and reform convert intends to keep Shabbos (i.e. not drive, no making fires, opening electricity, etc.) or keep the full taharas hamishpacha.
In any event, the great intermarriage rates in those religions (conservative and reform) are causing a high percentage of their children to be non-Jewish. While their Judaism was long ago discardrd, sooner rather than later there will not even be any Jews left in those religions.