Yes, I do.
I have more 25 selliers than retournés (4/2 I think), so it's not uncommon for me to pull the sellier insert out of one bag and put it in a retourné. It's fine. Might not be ideal or good for the insert long-term, but certainly works. (I have also been known to put a K25 insert in a K28 when in a rush, this definitely is not a clean solution

.) (ETA: you CAN squish a retourné insert into a sellier but I do not recommend. For a hundred euro or so it's worth getting the right size insert

).