Looking at mine which is less than a year old, there is a BIG color shift from 3 1/2 to 4.
My 3 1/2 looks like yours.
My 4 has a lot more orange in it
My 4 1/2 has more orange/pink in it
My 5 does not look as purplish as yours
I am looking at your image with color-calibrated monitor but I have no idea how color-correct your image is. Anyway, that's what I see. Hopefully it's helpful.