Yes you can, although it’s not advisable.
In the car world you can get away with mis-matched tyre brands. For example if you get a puncture you might end up with three of one brand and one that’s different. On everyday cars this isn’t a big issue, as long as the tyres are all of a uniform size and are all road legal.
In the motorcycle world it’s a bit different.
The only time you might want to run a different model tyre on the front and rear is if you’re in a pickle and your local motorcycle tyre shop can’t match you up with the same tyre.
Motorcycle and scooter tyres are designed to work together. Usually the front and rear have tread patterns that are optimised to disperse standing water. If you run different tyres you may end up with a rear tyre that has to deal with more water than it was designed to. This is unlikely to be dangerous but it’s not ideal.
Mis-matched grip is another issue. Let’s take a scenario where you’re riding a Triumph Street Triple. You have track-focused Pirelli Supercorsa V3 SP tyres on the bike but the rear is knackered. You replace it with a Metzeler Roadtec 01 SE, a great all-weather tyre. It’s wet and cold outside and you’re on your new Roadtec 01 SE rear with a well used Pirelli Supercorsa V3 SP front, it’s raining and cold outside. The rear tyre will grip far better than the front even when cold and the rear will warm up much faster. What will happen is the rear will start to push the front, as it finds grip where the front can’t. Also the rear will feel planted, making the bike feel stable but the front might be reaching its limits even though the rear is well within its limits.
You can see how it pays to replace two tyres at the same time and why it makes sense to run the same make and model of tyre.
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