Same rail for all Z4 e85 or e86 seats. You may run into some differences if your electrical? And you're going to manual? Part numbers on realOEM match up tho, so you should be able to swap your existing one over to the new seat without too much trouble
https://www.realoem.com/bmw/enUS/partxref?id=BT52-EUR-09-2002-E85-BMW-Z4_30i&mg=52&sg=10&diagId=52_2973&q=52107053948&series=E85
Part 52107053948 was found on the following E85 vehicles:
Z4 E85, Z4 2.0i, Roadster, N46, EUR, (BZ11) : Front seat rail
Z4 E85, Z4 2.0i, Roadster, N46, EUR, (BZ12) : Front seat rail
Z4 E85, Z4 2.2i, Roadster, M54, EUR, (BT11) : Front seat rail
Z4 E85, Z4 2.2i, Roadster, M54, EUR, (BT12) : Front seat rail
Z4 E85, Z4 2.5i, Roadster, M54, EUR, (BT31) : Front seat rail
Z4 E85, Z4 2.5i, Roadster, M54, EUR, (BT32) : Front seat rail
Z4 E85, Z4 2.5i, Roadster, M54, USA, (BT33) : Front seat rail
Z4 E85, Z4 2.5i, Roadster, N52, EUR, (BU11) : Front seat rail
Z4 E85, Z4 2.5i, Roadster, N52, EUR, (BU12) : Front seat rail
Z4 E85, Z4 2.5si, Roadster, N52, EUR, (BU31) : Front seat rail
Z4 E85, Z4 2.5si, Roadster, N52, EUR, (BU32) : Front seat rail
Z4 E85, Z4 3.0i, Roadster, M54, EUR, (BT51) : Front seat rail
Z4 E85, Z4 3.0i, Roadster, M54, EUR, (BT52) : Front seat rail
Z4 E85, Z4 3.0i, Roadster, M54, USA, (BT53) : Front seat rail
Z4 E85, Z4 3.0i, Roadster, N52, USA, (BU33) : Front seat rail
Z4 E85, Z4 3.0si, Roadster, N52, EUR, (BU51) : Front seat rail
Z4 E85, Z4 3.0si, Roadster, N52, EUR, (BU52) : Front seat rail
Z4 E85, Z4 3.0si, Roadster, N52, USA, (BU53) : Front seat rail
Z4 E85, Z4 M3.2, Roadster, S54, EUR, (BT91) : Front seat rail
Z4 E85, Z4 M3.2, Roadster, S54, EUR, (BT92) : Front seat rail
Z4 E85, Z4 M3.2, Roadster, S54, USA, (BT93) : Front seat rail