83 380 SEL engine to an 81 380 SEL body?

[benz fanatic]

I tried to find links about this but nothing much was there. I just bought a pristine 81 380 SEL with a locked up engine. I have an 83 380 SEL with a great engine. My plan is obvious. Now I noticed that the 81 has ballast resistors and a few slightly different components. Should I expect any major issues here? I thought these cars would be nearly identical. Thanks, Andy