As far as AmEng is concerned, does "trace" mean just about the same as "trail" in "break/blaze a trace", and — if indeed it does — can "trace" be used pretty much interchangeably in every which literal sense of "trail"?
It takes about two people to break a trace through the brush ahead… source
Only tortuous paths and blazed traces led over the Appalachians…
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Best Answer
'trace' does have a meaning similar to 'trail'. It is uncommon - probably the most famous is the Natchez Trace from Nashville to Natchez in Mississippi, set out in the early 1800s.
The implication is that a trail is more 'improved' and used than a trace. If I make a trace and others use it, it becomes a trail. The trace is more akin to the route you took than any kind of improved path.
I would not use the words interchangeably because of the rarity and this difference in meaning.