Regarding conversion to K11, I found this on the net.
(quote)It was determined that the 89/96 could easily be converted (Model 1889s could not) to handle the new cartridge by re-barreling the rifle.
1889/96s were converted to 1896.11s buy replacing or modifying the following:
A new barrel was added.
Already fitted the the barrel were new front and rear sights.
A pistol grip was grafted onto the stock of the rifle.
The new rifles were also fitted with 6rd magazines, similar to the 1889/1900 pattern magazine, minus the reinforcing ridge, although the magazine did include a bolt hold-open feature for when the magazine was empty.
A new trigger-guard was fitted to accommodate the new magazine.(end of quote )
So, apparently bolts weren't replaced.