Campagnolo UT bearing replacement

[Mezky]

I got a second hand bike with a Veloce Ultra Torque crank. There is some noise when pedaling so I removed the crank and found that one of the bearings feels gritty. I cleaned and applied some grease but I would like to replace it. I know that Campagnolo uses a 6805N (6mm) but the ones in this bike are 6805 RS (7mm). There is no play in the cranks with these bearings and rotation is smooth. Also the thrust washer is missing. Maybe to make space for the extra 1 mm in those bearings. Do you recommend to replace with the same model as the other is good? Or use the OEM from Campagnolo.