Edit : This question is better to be ignored until the following related question will be discussed enough.
I know "almost identical " is not mathematics. But if you have good mathematical words , please answer to my question. I learned (here StackExchange)I can compute an ellipse arc for my 2 end points and tangents at them. But I also learned there are possibly many other ellipse arcs of the condition. Then let me ask you whether these ellipse arcs are almost identical or not?
Thank you in advance.