The B16A, with no number suffix, came from the JDM 88-90 Civic SiR, 88-90 CRX SiR, and 89-92 Integra XSi and RSi.

The B18C was introduced in the JDM '93 Honda Integra.

Note, Japanese model years generally go a year earlier then ours by their legal system. EX: they got "'91" models in '91, while we get "'92" models in '91. A car made in Japan on December 31st, 1991 would be a '91 model on the Japanese market, but a '92 model for us. Neat stuff.

EDIT: forgot to mention, that's just the first gen B16A's. The B16A remained in production with minor differences until around '01-'02 in various models.