Not really. An 1800 rpm generator will be a 4 pole unit, a 3600 rpm
generator will be a 2 pole unit. A 4 pole, 1800 rpm unit is usually
MUCH quieter than the 2 pole versions. And engine life at 1800 rpm is on
the order of 5x to 10x the life at 3600 rpm.
Mechanically the generator itself doesn't care what RPM it turns at,
Other then possibly accelerated bearing wear which is minimal with
ball/roller bearings. The gumph about 1800 RPM vis-a-vis 3600 was
mostly heard from the marine users and was mainly worry about engine
life and noise.

Regards,

J.B.