Depends what you mean by "similar" and what you mean by "match". Nobody has actually cited any analysis made on the jacket fibers anyway -- just the ones in the rifle.
Calling the fibers similar is saying they resembled each other without actually being identical; they were almost the same but not exactly the same.
Saying the fibers were a match is saying they were identical; the same.
You were wrong to say the fibers were only similar. They were, as I stated, a match.