Mega Leg "Surosama" (Earth) vs Leg "Surosama"

[Chios1]

Dear Devs,

How it is possible for the earth monster "SUROSAMA" to be Mega Leg and give 8 points health and the same to be possible for the Leg one??

So the only difference between Mega and Leg is the 1+1 power/life ???

Could you please re-check and advise further??

Best Regards
Chios