Yup:
I ride both:
Redline 26er rigid singlespeed
Redline 29er rigid singlespeed
I find I’m used to the ride each provides and the difference isn’t that much, as I tend to carry the front wheel over holes on the 26er and just unweight a bit on the 29er. The 26er is much more flickable in apexes of turns yet the 29er is more stable.
Both fun!