B. pulchella is now known as Chrysothemis pulchella.
This pair of fine prints is an excellent example of how hand coloring can vary from one print to another -- both are based on a fine painting, a copy of which was then engraved on a copper plate and then printed in black and white (note the clear "plate impression" in the left hand print, made when the copper plate was pressed firmly onto the paper). Colorists then added the color, painstakingly painting each plate -- but different colorists sometimes used different shades, and seldom had the benefit of seeing the original plant or even the original painting.
In this case, the print to the left is truer-to-life.
Another print of the same subject can be seen here.