'02 Ranger had the 2.3l DOHC Duratec engine, 143 horse power and 154ft/lb torque
'93 Ranger had the 2.3l SOHC Lima engine, 100HP with 133ft/lb
So not even a close match up, and no they are not a plug and play swap.
The turbo helped alot for the Lima engine, like you said found in the merkur XR4Ti , mustang, and t-bird, depending on boost and inter-cooler they got horse power up to 145 to 175.
Many have done the Lima turbo swap with very good results
Outside of the turbo there are not any parts to swap that would be worth more than a few HP.
I would check your compression, '93 2.3l would be 9.2:1, so should have 165-170psi compression.
If timing belt is off by a tooth then compression drops and so does power