PS2 version and compatibility questions

Sorry if this has been posted before (my searches came up with nothing useful, maybe I'm using the wrong search strings).

Just want to settle something once and for all. Are Asian games compatible with Japanese PS2's and vice versa?

Also, anyone know the exact version (SCPH-) numbers for Asian PS2s and their Japanese counterparts (I recall that the last digit usually changes)?

My PS2 is the JP version (at least I think it is, since I live in a place where you can get JP, Asia and US versions of the PS2 at the same place) and I don't want to spend extra for the JP version at Lik-Sang or Play-Asia.
 
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