Just curious if anyone using multiple Spektra Halos have noticed a difference between motors (same cam on both)?

I am asking as I think one of my motors may be losing power overall.

Using two different motors on the same machine I found that one started at 3.6 V while the other was starting in the range of 4.5 V.

I noticed this when I switched to regular tubes and needles (multiple setup) vs going with t-techs, and it felt like one machine was stronger than the other. So tested the motors on one machine afterwards.

Just wondering if anyone else has experienced this, or if is a warning sign that the one motor is about to take a dive on me, or this is simply a variance between different motors.

Thanks in advance for you feedback and experiences.