It's worth noting that Queqiao-2's primary goal is to support the future lunar missions (Chang'e-7 and 8) in the lunar south pole region. Relay for Chang'e-6 on the far side of the Moon is just its secondary goal. That's why it was launched to a frozen orbit optimized for the lunar south pole, not the Earth-Moon L2 halo orbit which Queqiao-1 is using.
The hydrolox stage is shared one of the older hypergolic Long March rockets too, it looks like. Either way, unless there are more changes under the skin, it doesn't seem to warrant a new model number, like how the (frankly terrifying) Long March 5B configuration didn't get its own number.
The Long March 8 was designed to be an economical launcher for commercial launches. It even used to have a plan of recovery and reuse (which has been abandoned).
On the contrary, the Long March 7 series' primary feature is high reliability. They are designed to support flagship projects like China Manned Space Program and high-value geostationary satellites. I don't think they'll be used in commercial launches ever in the future.
