You will have to go to the relevant standards yourself to check actual RF heights and tolerences.
Another thing is that I know of no standard allowing the two sides RF of a valve to have this amount of difference. Is this original from the manufacturor, sides equall machined and treated same way (no variation in coating thickness)? Building length within allowed measurement?
Even if this will be acceptable when mounted with flange sealings, I would check with supplier, as this could indicate unpreciseness or sloppiness in machining or quality control, lower casting quality, and unacceptable variations in machining of other parts.
Systematic fault or not?