In 1970 I worked for a time as an advertising sales rep for a man who laid out his own camera ready copy which was then printed by a commercial printer. This man used an IBM Composer, I know that it was a major purchase for him and was probably the most expensive thing he bought to use in his business unless you count the Chevy Monte Carlo that he drove and I think the car may have even cost slightly less than the Composer. This is strictly a typeSETTER as opposed to a typeWRITER. In 1972 I went to work as a tech rep for Addressograph-Multigraph and was in and out of all kinds of small printing operations, I saw several Composers but I never saw one used as a simple typewriter, they were not practicle for such use. Office typing, if done on an IBM product, was done on the Selectric. The Composer was only used to set type which was photographed on a film negative and used to make an offset printing plate.
There are still old Composers around and I am sure that if anyone could produce a match for these documents by using a Composer they would come forward but I don't believe a match could be produced this way. Even if it could, the likelihood of Col. Killian having used one is almost nonexistant.
This site, The Shape of Days did create a copy on an IBM Selectric Composer, that was close, but not as close as the Word doc. It was also a pain in the ass to create. Here is the overlaid doc they came up with: 
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So it was possible that Killian created these docs on a Composer, but again I think about as probable as getting fair and balanced news from Dan Rather.