Phase2 came in March 1992, so there are a good few Phase2 L reg 16Vs out there (I had one). The differences are cosmetic only on the 16V (inside and out). The Phase2 cars have more soundproofing, seatbelt pre-tensioners and side impact bars, with an airbag from about September 1994.
Also standard on Phase2 were re-trimmed 19 16V seats (previously only available in the Williams 1), an electric sliding sunroof and "softer" styling items (mirrors, bar grille, side strips, lights, rear strip, rear wiper, heater controls and dials).