Thanks for looking for me. I had a look at these records a few weeks ago - firstly I wonder if for some reason they are duplicates.
I have discounted these Kalleske/s since the remarriage of the widow (Johanne Eleonore Kalleske - nee Franke) occurs shortly before these deaths. The second bit of disconfimring evidence - The death records here have an age that is too old for my guy who would have been about 36 at the time of his death.
I wonder if other branches such as the Pfeiffers have tried to trace back their family tree and what they have found out when they have got back to Johanne Eleonore Kalleske (nee Franke) but remarried in 1856 as Jaeger