If you change the motherboard and CPU it is a new PC now, so it won't be a match.
Anyway I would try to activate without using a new slot, if PT detects it as the same PC, it will activate without asking anyshing more (I used this procedure when installing two instances of PT on Linux and Windows on the same PC)

I spoke to support and did the upgrade and this was pretty much the conclusion. If you have a free slot then you can activite as a new slot first and then remove the old one.

If you don't have a free slot then you can try a new activation. If it is detected as the same machine then you are OK to go. If it isn't then the activation will fail and you can then remove the old machine which will create a free slot and allow you to activate.

I am planning a big upgrade on my PC – with new motherboard, CPU and system disk. All the applications will be reinstalled. However, I (hope) to keep the same Windows License and perhaps the same device name.

For PianoTeq is this the same hardware activation slot or will this be a new slot?

I don’t want to deactivate the existing registration and then find I can’t activate a new one as it counts as a match.

If you change the motherboard and CPU it is a new PC now, so it won't be a match.
Anyway I would try to activate without using a new slot, if PT detects it as the same PC, it will activate without asking anyshing more (I used this procedure when installing two instances of PT on Linux and Windows on the same PC)

My advice is: get an answer to your question directly from support!

And then please post answer here! I think it will be helpfull for others to!

For PianoTeq is this the same hardware activation slot or will this be a new slot?

I don’t want to deactivate the existing registration and then find I can’t activate a new one as it counts as a match.