How to use 540x 960 HDPI 9 Patch images for 480x 800 resolution

I used the 9 Patch generator online. But when I create resources it creates the HDPI resource as 540x960 pixels. To my knowledge the HDPI resources are usually 480x800 pixels. How can I use the resources correctly.

1. Is there a way to use the 540x960 px image in HDPI for 480x800 px also?
2. How do I create a 9 patch resourse of 480x800 px to use it for HDPI resolution. Is there any other tool available?