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Meant to @Gren.
Affordable (Heavy quotation marks).
Classic.
Premium (steel frame)
Top end (titanium frame).Is how I remember. As for parts interchangeability, A and C are basically interchangeable, while P and T often do their own thing.
Muc-ed-off
The C and A are new names introduced in 2021 for the classic steel design, the A having various cheaper components. The P line is similar but has a Ti fork and a significantly different (also Ti) rear triangle that takes different gear options (such as the 4 speed derailleur).
The T-line introduced many redesigned parts and has very little in common with the older models, other than sharing a rear triangle with the P-line. The major frame parts are Titanium and it has carbon forks.
The G-line has 20 inch wheels, disc brakes and shares some superficial design choices with the T-line, but is steel with an aluminium fork.
The pre-2021 Titanium models are similar to the A and C line but their forks and rear triangles and some other small parts are Ti, but with no significant compatibility differences.
Before 2021 bikes were known by a 3 letter/number code indicating their handlebar shape, number of gears and rack/mudguard-having-ness. There was also a thing called a B75 which was a precursor of the A-line.