Please see below two pairs of photos. You'll notice that the photos taken with the 350D have more true-er greens whereas the photos of the same object with a 650D show a more yellow-ish tint.
(Note that the lenses used are different, but I've tried swapping the lenses and it did not make a difference).
What do you suggest is the cause for the different greens? What do you suggest I change to make the photos from the 650D have the same color as the 350D?

Photo of grass with Canon 350D. Green of grass looks like a true color.

Photo of same grass with Canon 650D. Green of grass looks like it has more yellow.

Photo of tree with Canon 350D.

Photo of same tree with Canon 650D.
(Note that the lenses used are different, but I've tried swapping the lenses and it did not make a difference).
What do you suggest is the cause for the different greens? What do you suggest I change to make the photos from the 650D have the same color as the 350D?

Photo of grass with Canon 350D. Green of grass looks like a true color.

Photo of same grass with Canon 650D. Green of grass looks like it has more yellow.

Photo of tree with Canon 350D.

Photo of same tree with Canon 650D.