en.wikipedia.org/wiki/List_of_Volkswagen_Group_platforms
Quote:
Volkswagen Group PL/PQ platforms
platform code used for notable examples
PQ12 (NSF) ultra-compact city cars Volkswagen Up, SEAT Mii, Škoda Citigo
PL22/PQ22[speculation?] BX supermini cars Volkswagen Gol, Volkswagen Parati, Volkswagen Saveiro LB20
PQ23[speculation?] supermini cars Volkswagen Polo (6N - Polo Classic), Volkswagen Caddy, SEAT Ibiza (6K), SEAT Córdoba (6K), SEAT Inca
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It appears Gol and Polo are PQ2x, Golf is PQ3x and Passat PQ4x.
Both FWD, Gol originally with boxer four.