No, Colombian tegus are not the only Black n White tegus. The Argentine Black n White is the true Black n White. The Colombian tegus true name is the Colombian Black tegu, or Colombian Gold tegu.
1, No Colombian tegu is easy to tame, only the Argentine tegus are easy to tame, if done right. Colombian tegus do not become tame in my opinion.
2, No tegu should be fed inside the cage, it is better that they are never fed inside them. They can and will associate you with food. They will bite the hand that feeds them, this is not done in a aggressive manner. My advice to this is never feed them in their cage. Never let them see you feed them. The best way to cure this problem, is to not feed them in their cage. Put the food in a separate cage, then take the tegu from his cage to the food. This helps in many ways. You are putting him with the food, not bringing the food to him. This keeps the food aggression to a minimun. Also by doing this, you are handling him twice a day, once to take him to the food, and another when you return him to his cage. It also helps to keep from getting impactions. If you keep him on substraight, and remove him to feed him, then you could feed him on newspaper. Then there would never be a chance for him to ingest the substraights.
3, Tegus are one of the strongest reptiles, one thing that is very harmful to them is over heating. Tegus kept at high 90s to 100s will not live. They can take the cold much better than getting too hot. In the wild and here outside, tegus will not bask during the hottest part of the day. They will bask in the morning and evening. The hottest part of the day is spent inside their burrows.
4, As stated before, Colombian tegus do not like/eat fruit. The Argentine tegus do eat fruit. I feed mine a varied diet of rats, fish, turkey, boiled eggs and almost any soft fruit, no citrus or bananas. I do not have any Colombian tegus, I only raise Argentines.