The positive wire for both glove box light and boot light should be same. You can tap positive line from dome light t3/2 (red/black wire) or also from footwell light positive wire. Later will be easier to tap.
The ground wire connection for glovebox light and boot light are different.
Glovebox ground wire
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Boot light ground wire should be connected to boot lock ground wire. There is a beige colour t5 connector behind left tail light. Have a look, usually t5/3 wire (violet/purple) is where we need to connect boot light ground wire. Verify before splicing the wire or take a picture and post here.
Don't touch any wires of BCM
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