Is a project initially created under version 2019.2.11f1 can be opened with any 2019.2.x version without getting broken ?
In most cases, yes. However it might depend on what features of Unity you are using. For example if you use things which have been deprecated a long time ago, at some point it might get removed completely. This usually takes a long time. Just for example the WWW class has been deprecated quite some time ago but it still available and does still work. Though at some point they might remove it. Though such minor version changes usually do not contain major changes.
Regardless what might / might not change between versions, if you work on a serious project you should avoid changing the Unity version if possible. IF you really want / need to switch to a different version you want to create a full backup of your project before you open the project in a different version.