At least some of the color seen in the pictures of magnified red blood cells is from the chemical stains added to the cells to make parts of them easier to see under a microscope.
Other techniques for comparing these cells might reveal that one is darker or paler, indicating a higher or lower concentration of the red hemoglobin molecules.
Of significance here is that the staining reveals that each frog erythrocyte (Greek for "red cell") has a nucleus and none of the human erythrocytes does. The enucleation (removal of the nucleus) of the human RBC could have a real impact on its life and work.
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