As Jim indicates, these are just labels, most often used by shops selling kits, that are not designed from a specific known original rifle, but reflect a regional style and general era. Generally the "Early Lancaster" kits offered make a nice 1770's-1780's rifle, and the "Late Lancaster" kits are more 1790-1810-ish. Unfortunately the "late Lancaster" kits are not usually suitable for a Fordney etc, but could be, with some parts substitution.