2005 Dodge Dakota Interchangeable Brake Calipers?

Initial problem was the calipers were locking up causing the pads & rotors to heat up. Replaced the calipers, rotors, & pads but the brake pedal would go to the floor, even after bleeding. Tried a second pair of calipers, pressure improved but blew out the master cylinder. Replaced the master cylinder, back to a lack of pressure. Bled the system, still no pressure. Replaced the brake booster because there was a hole in the diaphram. Bled the system and still no pressure. The truck was at the same mechanic for 3 weeks. They had 3 different Dodge technicians come in and sent it to their competition, but could not get the pressure. The check engine light came on Mon and the code read that there was no communication between the ECU & the ABS computer. The techs finally gave up & had me take it to the Dodge garage. It took them only a day and they fixed it. They claim that the other garage put the calipers on the wrong sides. They also pressure bled the lines, where the other place gravity bled them. I, my father (a shade tree mechanic for 50 yrs), and the original place cannot fathom the calipers being put on the wrong sides. I'm curious if the Dodge garage pulled a fast one or not. Thanks to anyone that can shed some light.