That's interesting but I guess everyone is different. I definitely notice it immediately when I play with slightly narrower keys and that could be down to the fact that I don't have particularly big hands, so my 'stretch' is comfortable at an octave.It's got to be unnoticeable - I also play a Baldwin Acrosonic and other than it having full weighted 88 ivory keys other than my Yamaha having non-weighted 76 - I see / feel no difference.
Have you tried comparing your Yamaha's keybed to 76 keys on your Baldwin? it would be interesting to see if there is any difference but the good thing for you is that it doesn't affect your playing.