That should work, if I understand what you mean by, "... + & - wires coming out of it and I am going to solder those to motherboards CR2032 battery contacts".
If you mean the contacts on the board's broken battery holder, then I think it will work.
If you mean you would try to remove the broken battery holder first, and connect the wires on the new battery holder to the board itself, that would be much more difficult, and might not work.
Mother boards usually have multiple layers of electrical connections, which might only be ground paths, and if the battery holder is connected to one of the internal layers and not the one on the bottom of the board, getting the wires connected to the correct connection on the board might be impossible.
That might not apply to the battery holder at all, but is somewhat of an unknown. The contacts on the board's battery holder are the safest way to go. Just be VERY sure to get the + and - connections right, of course.