Not really. Using % of forecast area as % chance of rain inherently gives equal weight to your position being anywhere within that area.
Yes, unless your location is a statistical outlier the two are the same.
If you happen to know you are on the lee side of a mountain that might change thinks but for most people they are one and the same.
In Australia BOM’s Australian Digital Forecast Database uses a 3x3 KM grid for Victoria and Tasmania or a 6x6 KM grid for the rest of the country.
I’m in a 6x6 area but thats fine for daily forcasts.They also offer forecasts for 3 hour windows for the next 72 hours which is great for medium term planning but to be honest its the rain radar that I use the most. They offer a rain radar that has a 90 minute history and a 90 minute forecast that has sufficient resolution that I can time my breaks at work to stay dry.