'98 Stratus issues

Sorry for the lag in response.
If you use a donor, make sure the P/N's match or supersede one to the other. Either forward or backwards. the P/N should be on a decal on the PCM.
If a donor will work, a flash shouldn't be a problem. You will know very quickly. The PCM won't communicate to the scan tool to preform the flash. If you get communication, you're likely golden.
and by the way, I would have told you to replace the resistor too. That is the usual suspect on 99% of chryslers with no blower motor. But I have seen the pigtails burnt or broken.