hi - a bit late to this thread but seems relevant to my question as well.
is there any guidance for manufacturers beyond 2020-3? specifically, for a product which has gone through MDR certification (Class IIb, to be specific) and now has changes made - which we believe are non-significant. all I see is for devices under MDD/AIMDD and the transition period - but nothing for devices already under MDR.
could use a bit of a sanity check here. obviously we'll be updating the Tech File and associated documentation....
As of now there is not updated guidance on significant changes under MDR specifically

but here are the resources I personally reference - I would use all the information you have available to make a determination and write up a rationale based on that (whether you explicitly cite the guidance or not - I wouldn't cite 2014-3 for example, but I'd certainly read it and think about it).
1) Refer to the MDR itself- there are a few paragraphs that reference changes to the technical documentation.
2) I'd still look at 2020-3 even though it isn't strictly applicable for devices that are already MDR compliant. If it IS a significant change per 2020-3, I don't think it would fly as a nonsignificant change.
3) Does your NB have a form or notification process that they have you use? For example, BSI has a change notification form with a checklist of different items that may or may not be impacted, and then you document the rationale.
4) Anecdotally.... staff from my NB have, unofficially, suggested that the old NBOG 2014-3 guidance is still a useful reference, even though it is technically for MDD. I can't say with certainty whether your NB will agree and there are certainly conflicting opinions on this, but it's something.
Personally my team was not sure what to do either in the absence of MDR guidance. My notified body has a "non significant change" form where you document the change and defend why it does not require a full significant change review so I submitted a lot of non significant change notifications (for class III implantables and class IIa active) and most of the time, my NB agreed with our interpretation and signed off. Again, this is all dependent on your NB and probably the level of interaction you have with them generally.