I'm no expert, not even a good hobbyist. But, I can about guarantee that there is no interchanging between the Ruger, and H&R!
Walter
Maybe the 622, and 623 require fitting to function.
The convertible models we were speaking of are all very forgiving when it comes to changing cylinders.
I have bought and sold many 22 lr, and 22 mag cylinders for these revolvers, and have yet to find one that has not functioned well in another gun.
The 622, and 623, may or may not interchange as well.