Is it true that knowledge is the same as truth
You are asking whether it is true that T=K (knowledge and truth are the same). From your asking this, I conclude that you don't know whether T=K. If truth and knowledge were the same, then lack of knowledge would be lack of truth. So, assuming T=K is true, we derive the conclusion that T=K is false.
Better then to suppose that knowledge and truth are not the same.
And of course they aren't. Something may be true and yet not be known by many or not be known by anyone at all. For example, take the following two sentences: "with optimal play, white can always win in chess" and "it is not the case that, with optimal play, white can always win in chess". One of these sentences is certainly true; but no one yet knows which one it is. (Or, if anyone does now, they haven't told me, so I don't know which is true.)