Ah, 2K. It's been years since I played with that. *dreamy look*

Change Condition
Full Recovery
Take Damage

Those three a simply what they say - Change the heroes condition to something (poisoned, confused, dead etc); Full Recovery (ie heal); Take Damage (simply knock off some HP).

Call Shop
Call Inn

Again, do what they say on the tin. 2K3 has similar things - Shop is a shop (you choose which items to put in, and at how much, and the player can buy them); and the Inn allows you to rest.

Ride Vehicle / Dismount
Setup Vehicle Place

Again, pretty simple - get into/out of a vehicle; set the place where you want the vehicle to be, rather like start party position.

Change Parallax BG

The parallax BG is the screen background - say you're stood on a cliff, and you want a view of below, then you set the rest of the map as pink (or whatever your transparent colour is), and set the parallax BG to be an image of the view.

I don't know about:

Set Hero Walk GFX
Swap Events
Enter Password
Goto Label

RM2K3 has most of these things, anyway, so it shouldn't be too hard switching between the two.