92-95 JDM Si = B16 Hatch EG
92-95 USDM Si=D16 Hatch EG
92-95 USDM EX=D16 Coupe EH
No Actual EX is listed in 92-95 its under the Si as the EH chasis, In 96 they added the denotion of the EX specific model and chasis with the D16Z7,D16Y8VTEC.

94 the EX had the other engines optional seperate from the Si but was never a Actual Model until 96 ?

Looks like the EX in 92-93 was a option USDM coupe version of the Si. Some denoted Si/EX. This isnt making since ! Every Chart i read contradicts itself.