Which CPUs fit this board?

It uses the LGA 1151 socket with the B250 chipset, so 6th and 7th generation Intel Core desktop processors are the intended match. Confirm the CPU your V410z shipped with before ordering.

Does it take DDR4 SO-DIMMs or full-size DIMMs?

The listing specifies DDR4, and all-in-ones of this generation typically use SO-DIMMs. Check the memory type in your V410z before buying.

Is this the same as 01LM191?

The board is listed under both 01LM192 and 01LM191 at version 1.0. Match the number printed on your old board to be sure.

Will it fit a standard ATX case?

No. It is shaped for the V410z all-in-one chassis, with that machine's mounting and port layout. It is not a general-purpose desktop board.

What comes in the box?

Expect the board itself. Cables, cooler, I/O shield and manual are not indicated, so reuse the parts from your V410z.

Is it worth it against a used OEM board?

Both are pulls from the same platform. Choose whichever matches your part number and comes with a return option, since failure rates on used boards are similar.