Yes, different species entirely, but the care for them as babies is identical.tom but aren't the African spur thighs tortoise, diff from leopard tortoises ?
You have a brand new baby there. Babies are hardy, but there is less room for error. There is not time for you to learn all this on your own. PLease read these links. It will just take a few minutes and it will answer all these questions you are asking.
http://www.tortoiseforum.org/threads/how-to-raise-a-healthy-sulcata-or-leopard-version-2-0.79895/
http://www.tortoiseforum.org/threads/beginner-mistakes.45180/
http://www.tortoiseforum.org/threads/for-those-who-have-a-young-sulcata.76744/
Your tank is much too small, they should not be housed as a pair, they need the right substrate, they need to be soaked daily, fed the right foods, and their temperature must be correct day and night. The solutions to these issue need not be expensive or difficult, but these things need to be addressed and corrected right now. Get crackin' mister!