Default Different Vibrating motors?

Anyone who had his/her phone replaced, have you noticed different vibrating strengths? On my first M8, the motor was so strong, it almost was too strong. Just got my replacement one (the first had a broken ear speaker), and the vibrating motor seems too weak. I have the same firmware, kernel and custom ROM installed. I also checked to make sure I have the same setting for virating in the custom kernel. Weird.