So after reading through all of these and others It seem to be that the styles are the same but different bar ratings for the two caps with the higher being on the radiator and new plumbing as a safety device for excess pressure. I still could not find out whether replacing both of the caps to the same pressure is good or bad. I purchased the radiator from oakos whom i have always had great luck with and they told me i need to replace both caps with the same pressure. are they trying to sell me a second cap? or is there a method to the madness. Theoretically if both caps are the same pressure they will both vent at the same time. Will this cause air in the system? It should not since they are both venting but as the system cools and excess has been vented will the remaining space create air and not be sucked out of the rad resivior fast enough? or since the resiviour cap is at a higher point in the system will it be cheated the ability to properly discharge?
There seems to be much debate and inconclusiveness on the matter. crucial says the will sell both.