Interesting question. My first thought was that it is not necessary because the + distinguishes the two moves.
However, I looked it up in the Laws of Chess (Appendix C).
C.13 states: "It is not mandatory to record the check [...] on the scoresheet." I think this means you would have to write the file to.
Maybe we should bring this problem to the attention of Geurt Gijssen to get a definite answer...
His column is one of my favourites on ChessCafe.