I've sussed it out myself...
Here is a list (from JT Sprockets) of all Kawasakis that have a 530 front sprocket that will fit straight onto the Z1000J, Z1000R, Z1100R, GPz1100B1/2 engine:-
16 Teeth
GPZ750 R (ZX750 G2-G3) 85-88
ZR1100 A1-A4 Zephyr 92-95
ZR1100 A1-A4,B1 Zephyr 91-97
17 Teeth
GPZ900 R A1-A6 (ZX) Ninja 84-89
GPZ900 R A7-A12 (ZX) Ninja 90-96
ZX900 A1-A3 Ninja 84-86
ZX900 A1L Ninja 84
ZX1100 D1-D9 Ninja (ZX-11) 93-01
ZZ-R1100 (ZX1100 D1-D5) 93-97
ZZ-R1100 (ZX1100 D3-D6) 95-98
ZZ-R1100 (ZX1100 D6-D7) 98-99
ZZ-R1100 (ZX1100 D8-D9) 00-01
ZX1200 C1-C4 Ninja (ZZ-R) 02-05
ZZ-R1200 (ZX1200 C1-C4) Ninja 02-05
ZX-14 (ZX1400 A6F,A7F,A8F) Ninja 06-08
ZX-14 (ZX1400 C9F,CAF,CBF) Ninja 09-11
ZX-14 (ZX1400 ECF,EDF,EDFA) Ninja 12-13
ZX-14 (ZX1400 FDF,FDFA) Ninja ABS 13
ZX-14 (ZZR-1400) 06-10
ZX-14 A6F/A7F/C8F/C9F/CAF/CBF Ninja (ZX1400) 06-11
ZX-14 ECF/ECFA/EDF/EDFA Ninja (ZX1400) 12-13
ZX-14 FDF/FDFA Ninja (ZX1400) ABS 13
ZZR1400 B6F,B7F,D8F,D9F,DAF,DBF 06-10
ZZR1400 ECF,FDF 11-12
ZZR1400 Performance 11-12
ZZR1400 Special Edition 13
18 Teeth
ZX-12R (ZX1200 A1,A2) Ninja 00-01
ZX-12R (ZX1200 B1,B2,B3,B4) Ninja 02-05
ZX1200 A1-A2 Ninja (ZX-12R) 00-01
ZX1200 B1-B4 Ninja (ZX-12R) 02-05
18 tooth front sprocket and 38 tooth rear sprocket is about right for most applications.
These are the dimensions for the standard 630 sprocket:
and these are the dimensions for the 530 sprocket (JTF517).
It should be noted that there is no offset on the 530 sprocket. However, with the thinner chain I'm hoping the chain will clear the engine.

Kawasaki H2C 750, ZRX1100R, H**** VF1000RG Rothmans, H**** VF500F2F, Suzuki GSXR750F Slabbie