The p72 is the factory obd-1 b18c1 ecu
The p30 is for the del sol vtec(b16a3), The b16a doesn't have secondarys like the b18c.The p30 won't operate the secondarys.
I'm running a p72 on my b16a and I noticed that my car ran on the rich side before I went with hondata. I believe the fuel maps are a little different.