So here are some measurements. 072 should be around 16.3 m wide at its widest.
This new LCU should therefore be around 7.1 m wide. (its rear ramp would then be little under 5.1 m wide)
Using previous imagery, the width of the rear ramp on the 071 is some 19.3 m.
The deck is narrower than the door, by around half a meter on each side.
So the overall width of the well deck is likely around 18 m.
Conclusion: this LCU is sufficiently small to fit two, side by side. While leaving little over 1 m of clearance between the two craft and between the well deck walls.
The new LCU is therefore visibly smaller than the US LCU classes.
US is currently using the 1466, the 1610 and the 1627 classes. Last two are quite similar and seem to be widely used within USN. The 1466 is older and truth be told I haven't seen it a lot in US exercise footage. Perhaps it's on its way out of service?
US landing ships use three main categories. The LPD and LDH - which have a 81 by 15.2 m decks. And the LSD ships which have 134 by 15.2 meter well decks.
The 1610 and 1627 classes are 41 m long and have a beam of 9.1 m. Their light displacement is 175-200 tons. Their full displacement is 360 to 390 tons. (curiously, the bigger craft is credited with far less cargo capacity. Just 127 tonnes compared to 183 tonnes for the smaller of the two. That may be an error.)
All US craft are credited with 1200 nmi range (2200 km).
While the numbers above wouldn't suggest it, the US LPD/LDH can hold two LCAC, due to some overhang of the ramp over the edge of the well deck.
But clearly, they're far too wide to be parked two in a row. (18.2 m combined width of two LCUs, compared to 15.2 m wide well deck)
So, the new Chinese LCU is purposefully designed so it compromises on capability, when using 1 on 1 comparison with the US LCU. But that can only mean it was done so other things could be taken advantage of. Indeed, if Chinese navy isn't planning to park 2 of those LCUs side by side in their large landing ships - then they're not utilizing their full design potential.
Given that the length of the 071 well deck is closer to the USD LSD ships, it's plausible each 071 could carry 6 or even up to 8 of such LCUs.
Of course, each individual LCU, being small, can carry less stuff. For sure it's not been designed to cross 2200 km. But probably far, far less. Possibly even closer to 500 km rather than 1000 km.
It's probably little under the capacity of the British Mk.9 LCU. Which is 30 m long, 7.7m wide, has 1100 km range and full displacement of 240 tons.
Still, the chinese LCU, even if around 200 ton displacement, is likely to be sized to carry one MBT, or four 15-ton vehicles, or a company sized infantry unit without vehicles.