Is LGPL-3.0 compatible with LGPL-3.0-or-later?
Yes.
Same license line: the 'or later' work can be used under LGPL-3.0-only, so the two combine.
Result license is the more restrictive of the inputs. You must satisfy every input license's notice and source-offer terms. Verify pairwise compatibility first.
Resulting work's license: LGPL-3.0-only
General guidance, not legal advice.
Obligations when redistributing as open source
- LGPL-3.0: retain the copyright notice and license text.
- LGPL-3.0: state significant changes made to the code.
- LGPL-3.0: publish the source of any modifications to the library itself.
- LGPL-3.0: modifications to the library must remain under LGPL-3.0.
- LGPL-3.0-or-later: retain the copyright notice and license text.
- LGPL-3.0-or-later: state significant changes made to the code.
- LGPL-3.0-or-later: publish the source of any modifications to the library itself.
- LGPL-3.0-or-later: modifications to the library must remain under LGPL-3.0-or-later.
Other distribution models
The verdict is the same under every distribution model; the obligations differ.
Check this pair in the tool to switch models.