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Kadir, yes Sir, 9 shots for both is correct. All Heritage Combo Revolvers have matched capacity 22LR and 22 Magnum Cylinders. Cheers and stay safe!

yes they are both 9 shot the 22 mag is just slightly larger in diameter and length

Ok kept looking and found this on heritages site When "When more lead is on the menu, reach for the Rough Rider® 9-shot.
These single-action revolvers are chambered for .22 LR and .22 WMR, with cylinders configured to host nine cartridges instead of the conventional six.
This line of revolvers come standard with solid Cocobolo grips
This version chambered in .22 LR and .22 WMR, includes two cylinders."
Then downloaded the manual for that particular pistol and it says this-"8. Only the 6-shot cylinder will work in 6-shot gun.
9. Only the 9-shot cylinder will work in 9-shot gun."
Thats in section 22 of the manual for the pistol you are looking at, so od say that confirms it.
Manual can be downloaded at the bottom of the page here. https://heritagemfg.com/small-bore/9-shot-rough-rider/88-6-5-rough-rider-22-lr-22-wmr-black-standard-cocobolo

22 Magnum” was released 75 years after the . 22 LR. It has similar proportions as the Long Rifle, but the main difference is the extended case, which allows for more propellant behind a bullet that is often the same size. The round is used for a variety of purposes, including target shooting. The cylinders should be the exact same width and hold the same capacity I couldn't find anywhere that confirms this but I'd say it'd be very likely 9rds for each.