Musical Improvisation, like any form of language , has a base in patterns and schemes which an individual would use more or less consciously as the fundament upon which he can elaborate applying his language to a given situation.
So, most of us, while talking, will use, groups of words, idioms and verbs in a sequence that can be recognized in almost anything we say because that is unique to each individual, a sort of fingerprint (the police forces nowadays use a lot of this analysis).
You can tell where a person comes from, what level of studies he has done, you can tell the town, the quarter, the street, the family he grew up, from his language.
The same happens to music.
We will put in our music all the things we have heard before, all the things which worked in similar situations before, all the things we've studied.....and a little bit more, hopefully, which is unique to that time and that place, but the impro will be based on elements which anybody tends to use repeatedly, because they are our own specific way to express ourselvels....... even when they come from somebody or something else.
So you will find and recognize typical elements and more or less the same components in any impro although the way they are arragend can be absolutely unique, yet elements of it will be recognizeable, because they are our fingerprint.