The flat steel tube in a zig-zag arrangment with cooling fins is a serpentine tube.
The mini water radiator with small tubular end tanks and straight tubes between them is a parallel flow type.
The two types are quite different inside.
The serpentine tube design was initially developed when R12 gas was used. When R12 was discontinued and replaced with R134a it was quickly realised that a higher capacity, more efficient condenser was needed, due to the thermodynamic differences of the new gas. The parallel flow type condensers are significantly more efficient, and significantly more expensive!
So, yes you can get away with fitting a serpantine tube condenser to a 20VT, I have one fitted to my Coupé. But it needs to be accepted that it will never be as efficient as the original parallel flow. On really hot days the car won't cool effectively. Using the air recirculation will help, a bit, but it will still struggle.
living in the UK though we rarely see temperatures in the mid 30's so the old tube type is acceptable, and cheap.