Having hard time finding info on this JDM RX7 FC
 

I am looking at a 1990 RX7 GTX FC JDM RHD Turbo. But some things look kinda weird.
It has the S5 tail lights, S4 front bumper, S4 gauges and 2+2 cloth front and rear seats.
I am still not sure on the difference of S4 and S5 turbo engines.
This one says "Turbo with intercooler" but from what i have heard, turbos for the S4 were Turbo2?

If anyone could help me please. Thank you.

For anyone looking for info
 

I have done some more research and it seems like the JDM S5 came with an instrument cluster that red lines at 7k, when the S5 NA has a redline of 8k.

This confused me and I will leave this for anyone in the future that also has this problem.
Please correct me if I am mistaken.

Better FC to look into is the Euro Spec FC. Taillights have a rear fog from factory , has fender lights , front turn signals are different. The jdm cluster i believe is exactly the same as the turbo 2 cluster unless its the re amemiya cluster