The actual efficiency of the AC/HP combination is something that is very difficult to predict with a non-matched combination. So in reality, if it isn't a matched set, meaning all parts of the mechanical items, including outdoor unit, indoor coil and blower, then there are no ratings published that can produce a document you can show someone and claim that efficiency. However, some manufacturers do submit efficiency data for indoor coil and outdoor unit without a blower. The assumption in those cases is that the system is being installed on a non-variable speed product and therefore the actual efficiency is lower. But even that is not always correct. For example, you could have an oil furnace where someone has installed an ECM blower motor to improve the electrical efficiency of the furnace. Adding AC or HP to that unit will inherently have a higher efficiency than if the blower motor was the original PSC motor. In addition, even with a V/S-ECM motor, if the duct system is under sized, you could get a lower energy efficiency due to the higher amps drawn by the ECM motor trying to operate against excessively high static pressures.
So in the end, the actual efficiency you get from your house and equipment combination isn't really something anyone for which anyone can actually print a rating paper with any guarantee that it reflects your actual operating conditions. All of that said, sometimes there are more features and benefits available on higher SEER/EER/HSPF units than are available on lower rated units.
Finally, when it comes to heating with a heat pump, the SEER and EER ratings are not really the important rating. It's the HSPF rating that is the best indicator of efficiency and that can be higher with lower efficiency equipment or higher efficiency equipment. So check out that number and you might also want to entertain the idea of installing an ECM motor along with the HP for your oil furnace and enjoy the higher efficiency (assuming you don't suffer from high static, which should be checked before installing the new motor) even if you can't get a certificate that claims what efficiency you're actually getting.
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!