The standard Spanish pronunciation of "j", "jota" ['xota] sounds like the Scottish English "loch" or in German "ich". Sometimes it tends to be stronger [χ], especially in emphatic speaking. Example:...
I'm not sure what you mean here. The letter "j" is used in both languages. The sound in Spanish is similar to a somewhat guttural "h" in English, sort of like the sound of "ch" in the word "loch".