Well, it's a long story, but the shop that was doing work on my Kick accidentally ordered the wrong engine (they said they ordered an engine for a manual-tranny model). Instead, my original engine ended up being rebuilt. That's where I got the idea that they're different.
About mounting the tranny to the engine, I've heard various opinions on what adaptor plate is best. Calmini's (which noone has mentioned to me) appears to be heavier duty, like it's more of a plate, whereas others seem to be laser-cut to the precise outline of the tranny's mounting surface, meaning less metal...but maybe that doesn't matter in terms of strength.
Also I've been reading here that OBDII engines CAN be legal in CA if done a certain way. I was thinking of getting my wiring harness professionally reworked for the swap, but I know Trail Tough says it won't be legal, so I'm wondering if there's some company that will rework my harnes with provisions for the second O2 sensor and whatnot.
...time to go to Harbor Freight and pick up one of their cheapo engine hoists