I’d say it would be possible to mount 2.75 on 25mm, but I wouldn’t do it. So comfortably - no. Wider mtb tyres are often designed for wider rims. Even 2.5 maxxis has ‘wide’ designed tread patterns optimised for wider rims. Might be more likely to roll off or burp though if you run low pressures as well.
Why do you want to run 2.75?