We're having an issue with a quick disconnect coupling for an outdoor gas grill. The owner downsized and moved to a smaller home in the same subdivision. It is a natural gas grill that was connected to the house gas in the old house, but cannot connect at the new house.
Their grill hose has male connector marked ANSI Z21.54 CSA 8.4. Female connector on the old house is marked ANSI Z21.41 CSA 6.9, and has three ball latches. Female connector on the new house is marked ANSI Z21.41 C, and has six ball latches. The hose goes in and bottoms out close, but not enough, for the balls to latch. There's no apparent damage to or blockage of either of the couplings.
In my research I couldn't find a comprehensive table or comparison of different types of connectors, or if there are, indeed, differences. I've seen some city mechanical/building codes specify particular edition of the standard (e.g. ANSI Z21.41-2014), but no descriptions. CSA bit appears to be a reference to Canadian Standards Association, so it's not necessarily helpful.
How do we ensure that we get proper connector, or diagnose the problem with the existing one?