Who will service the dishwasher? Are the warrantees the same?

If the dishwasher has the same model number, it is the same product regardless of where you buy it. Read the installation manual to be verify that the electrical outlet and water supply are in supported locations, and that you have a way to connect the drain line (e.g., to a garbage disposal if you have one).

The catch is it’s an LG. They are awful for breaking, and needs nonexistant parts and service.

We have had great experiences with LG dw and fridge. tens years out and no problems with either.

Hopefully, no worse than the 2017 Bosch it's replacing. It burned out its own power connection; my own direct wire lasted about a year.

(I look back fondly on my first home as a singleton with only a fridge and stove to worry about.!)