difference in dashes???

the odds that someone here has done the exchange with exact same year models is slim. Some may speak of experience with similar exchanges though.
Like the opening for the ignition switch bezel. Cut it into the 71 dash housing or fill it in the 69 housing. I can even suggest an alternate use for that 69bezel in a 71 model. A standard housing can be cut to rallye instrument panel opening easier than filling a rallye to standard panel opening.
Good luck with the attempt at exchange. We'll try to help you clear any hurdles you confront.
Funny how someone starts with "Please dont take this the wrong way"
but it happens anyway.