Given the context of American options, let's delve into their specifics. Both an American call option and an American put option are set to expire in 3 months. They are based on a stock currently valued at USD 40, which notably does not pay dividends. The strike price for these options is USD 35. Additionally, the prevailing risk-free rate is 1.5%. With this information, what are the minimum and maximum possible differences in the prices of these two options?