as I use the Manx Museum I'm not 100% certain just what is on LDS films - however for those films of the 1911 official copy of the parish registers I have looked at (& I think available as LDS films under title 'parish register'), the burials for that parish are on the same film as the baptisms and marriages - I thought the films in the Manx Museum are from the LDS master - thus it may well be worthwhile checking at your local FHC