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I think the std. changer is a M-bus changer, anyway it was on my mk2 ph1 and if it´s a Alpine you can get a M-bus to Ai-net so it might work with a alpine H/U. Not sure but Alpine would defo know if you write a mail and ask them.
if, as Michael says, its an M-Bus changer you might be in luck, but in general OE changers dont work with anything but the OE head unit
general rule with cd changers is that they have to be hooked up to the same make of HU and in some cases also use the same connection system as some manufacturers have changed theres to somethin new