If you are asking if there is some reason it is excluded from being an equivalent because it is your device, as far as I know, there is not.
If you are asking whether your NB will accept it as equivalent per the MDR because FDA accepted it as substantially equivalent per FDA regulations, without you needed to provide any further justification, only your NB can say.
I would definitely not say "because FDA said so. " Instead, I would provide the same justification that was provided to FDA, and leave FDA out of it. I don't think all NBs enjoy being told that FDA is the authority on all things medical devices, not them.
So I think that means the real question is whether the justification that was provided to FDA will suffice for your NB. Again, only your NB can say, but I would suggest you think about the matter in those terms, consult the MDR and any EU relevant guidance that has been issued regarding equivalence, and then see what you come up with.