Is there much difference between 160x240 pixels and 240x400 pixels?

Answer 1

The only differences are the number of pixels involved, and the shape of the rectangle they form.

160x240 pixels is a rectangle of 38,400 total pixels.

240x400 pixels is a rectangle of 96,400 total pixel's.

Note that because the two rectangles are not the same shape, if you are trying to re size an image or change the size of a photo you are about to take, the two sizes will not give you the same picture shape. To achieve a larger or smaller image without altering the shape, multiply or divide the two numbers on either side of the "x" by a common number. For example, multiplying the numbers by two would result in an image twice the original's size, and dividing them by 2 (or multiplying by 0.5) would result in an image half of the original's size.