The information originates from Flugbuch of Herbert Jentsch... I checked it now and he changed the 2836 between these dates to 2835. It is clearly readable (on previous and following pages). I do not know this reason, it would be a great coincidence to receive new aircraft just one W.Nr.digit different (but not impossible?). Unfortunatelly I do not know a photo of M8+IM to confirm any of these W.Nrs.
https://ibb.co/LdPdqPNY