It works both ways depending upon the factors you're considering - we must remember that the JD/JS is being matched to existing profiles wherever possible and that for each factor the appropriate levels have been defined for matching panels already - for instance on the job profiles for a Medical Engineering team manager (in charge of an EBME site or group of technicians) at Band 7 may have a lower level in the factors associated with physical effort than a Band 2 medical Engineer (perhaps standing and sitting for long periods but not handling/moving/carrying equipment like the medical Engineer, for example).
The band 2 Engineer has the potential to score higher for the factor "Physical Effort" than the Band 7 Medical Engineering Team manager. I suspect that even given a similar statement in the JD/JS the maximum level that can be applied to each band is "capped" and what you attain relative to the maximum level attainable depends on what's been written in the JMQ for the post. If you look at the Medical Engineering profiles and the levels that are pitched for different factors, for the same factors on each band, then you'll probaby see what I'm getting at. I'm just trying to think of possible reasons for the differences you raised, not give a definitive answer.