I see the same person always complaining about darker helmet-lighter jerseys, but it really never was a problem for me. When I first climbed aboard I noticed the darker helmets and was okay with it.
Different materials used, lighting, film, all give contrasting shades of the blue. You can compare photos, and I have many that show different contrasts all depending on the above factors. 1973 thru 1976 all had blues that looked darker and lighter, or close to the same darker royal. In real time the helmet blue was for the most part darker than the jersey, but I don't see the need to bring this up as a complaint in every Ram uniform thread.
Sometimes the canary Ram pants looked faded, sometimes brighter. The Vikings, Chargers, and Giants had the same darker helmet than jersey thing going. The Cowboys helmet didn't exactly match their pants which were more of a blue shade. Now there's an OCD nightmare to wake up sweating to!