I think Johnie Houlton flew both aircraft on the same day . That would tie in with ML407 being damaged and quickly repaired.

Johnnie Houlton flew ML407 for 35 min om D-day, He took of in a spare aircraft that day. That being ML176, he also flew a mission at 1445. On that mission he flew MK950.
MK732 was flow by K.J. Mac Donald. He shared a kill with Johnnie Houlton. That being a Ju88. So ML407 did only fly for a few min. On the D-day. This al according to Spitfire the New Zealand Story.

Herman