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Basically, you got tires that are slightly wider, while the profile is similar at 75.
It's difficult to comment without knowing the car, but older cars are finiky in such matters.
Your new tires, owing to greater contact patch, will provide greater amount of grip, although this will not be noticable. Rolling resistance will also increase slightly, and fuel consumption could also increase, marginally, but I don't think that's gonna be observable in olden carz.
If the tires are too wide, they affect the handling. Car may tramline at certain speeds. The 75 profile will ensure you have a plush ride. My carz have 60 oe lower, sporty, but harsh. Better load index as well. Good choice overall. If the dealer was remotely competent, he wouldn't fit a wrong size. Oh well, enjoy.
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