Pressing Backspace will Delete Node (OSX)

Is it standard to delete your selection with backspace in Mac? As in, if you select files and hit backspace, would that be the same as selecting and pressing delete in Windows?

In some software, yes. Commonly, it's also Command-Backspace (it's normally not delete, though).

This is about the smaller Mac keyboards (chicklet and laptop types).  Luckily I held onto the older full keyboards that have both keys separate.

"If you select files and hit backspace, would that be the same as selecting and pressing delete?"

For files in the Finder, no.  For many other applications, backspace and delete both kill whatever is selected; they differ only when there is nothing selected (such as between letters of text).  In my experience, this is generally true for Windows and Mac OS X, though individual examples differ all over the place on this.