"Unmatch control word" - cause

[salvomic]

shortly,
type(EXpr) Returns n in [1..12] that defines the type of the argument, so i.e. type("abc") return DOM_STRING.

TYPE() -you can read in the Help- Returns the type of the object:
0: Real
1: Integer
2: String
3: Complex
4: Matrix
5: Error
6: List
8: Function
9: Unit
14.?: cas object. the fractional part is the cas type

So they have different use.
For the rest, in the post I linked we discussed about "unlatch control word" error, that seem too strange also to me...

Some objects in the Prime are a bit complex, like Matrix that also a list, so in some cases you can get type 4 or type 6, but the context will be determinant every time...

About Type(), please, read also this thread.