Palmermd: Given, any EVSE's J1772 connector should be expected to be manufactured to work properly with any EVs J1772 inlet. However, a given connector should be expected to work properly only up to its rated maximum amps. A "J1772 30a connector" should not be expected to work properly at 70a or 80a. I would expect only a "J1772 70a (or higher rated) connector" to work properly up to 70a. Likewise a "J1772 70a connector" should not be expected to work properly at 80a. I would not think that, say, a 70a rated EVSE manufacturer would attempt to use a 30a rated connector for it.
BTW note that an XXa rated EVSE should communicate with the charger of any EV it is plugged into saying in effect: "Hey, don't try to draw any more than XXa". If, say, a defective charger does try to draw more than XXa, there should be at least the circuit breaker connected to the EVSE that trips.
BTW note that an XXa rated EVSE should communicate with the charger of any EV it is plugged into saying in effect: "Hey, don't try to draw any more than XXa". If, say, a defective charger does try to draw more than XXa, there should be at least the circuit breaker connected to the EVSE that trips.