Have no experience with grape vinegar. The difference would seem to be in acid contain and, which is more I do not know. I'm not even sure if there would be a difference between red or white grapes. Sorry, with hope someone with far more experience will stop by...
If folks are switch from normal Vinegar to apple vinegar as a cleaning agent, they are going to be unhappy as 'vinegar' as a group, has no effect on a SARS based virus, which is what we are all faced with. They need to be using a disinfectant product!