[oil pan 4]

You can go a little smaller if that is the direction you need to go from a money and part availability stand point.
But from what I can remember 14lb/hr is about as small as they get.

Just learn about the current and past generations of injectors. The 97 ford ranger likely uses the same foot print or style of injector that most of the vehicles ford produced from the some time in the mid to late 90s until recently.
The good thing is auto manufactures don't actually make the injectors, they use injectors provided by an out side company like Delphi, siemens or bosch (or else ford would come out with new style of injector every 2 or 3 years for each engine for absolutely no reason)
Once you find your injector foot print is then you just have different variations in numbers of nozzles and pounds per hour.
As you know, you want more nozzles from a later year with as close as 14lb/hr as possible.

The oxygen sensor will try to bring the fuel mixture to where it needs to be, but the computer is programmed to see that air flow readings into the engine, injector pulse times and oxygen sensor readings should fall with in an expected range. When you put in larger injectors the computer will expect to see different readings. Small corrections can be made but that is usually to overcome fuel pressure variations going high or low for whatever reason.

I did a little big of digging and it looks like the 2.3L ranger uses EV1 style injectors, which is just about the most common style of fuel injector in the world. The other style injectors might work too with electrical adaptors or cutting and replacing the injectors electrical plug.