On the left are the original releases while on the right are the new variants from the Original Members 7-pack exclusive.
Batman: new version is blue, instead of the original's gray
Green Lantern: costume is a deeper black, green isn't as bright, and ring is unpainted
Martian Manhunter: greens and blues are lighter shades
The Flash: red is brighter, though its hard to see in this pic
Superman: blue is darker, and flesh tones are darker