Different H Engine Types
This is just an educated guess.
HC-C Single OHC Carbie 1.3L Found in G10x-G20x Charades
HC-E Single OHC efi 1.3L Found in G10x-G20x Charades
HE-E Single OHC efi 1.5L Found in G20x Charades
HD-E Single OHC efi 1.6L Found in Detomaso Charades & Applause's
I think i've left out a few here, so fill me in.
Some pics from another site http://home10.highway.ne.jp/cwl/engine.html