The BMP 180 module uses the Analog 4 and Analog 5 pins. These pins on the Pro Mini are not broken out on with the other border pins (see image below). However, these two pins are broken out normally on the Pro Trinket (see image). This makes it easier for me to prototype with any chip that uses Analog 4 and Analog 5 pins such as those that use I2C protocol at a gain of overall size ofcourse.