I had a CBP officer question my identity at YUL preclearance because "your passport photo doesn't look like you" and this was after I had been through the GE kiosk (fingerprint) identy verification.

I stared at him and simply scratched my bearded chin without saying anything, since my photo is pre-beard. Fortunately it didn't come to me asking if he thought the GE kiosk made a mistake when it read my fingerprints.

My bigger concern is that I use my NEXUS card for ID at TSA checkpoints in the US, and if a CBP officer decides that he's better than automated fingerprint ID verification, it is only a matter of time before I get in a Mexican standoff with a TSA agent:

"This doesn't look like you. Do you have any other ID?"
"That ID is me and it is valid, and is the only ID I'm producing for you."
(rinse/repeat until I am allowed to pass or get tossed from the checkpoint)