This isn't recommended. Manufacturers use different "formulas" for their rubber compounds, and the way the build the tires is different. So you can never be sure that the tyres will have the same grip characteristics. I've not seen any authoritative tables of "mixed and matched" rubber recommendations - I'm sure there's a good reason in that, you just don't do it.
But, if you are asking about what happens when you are in desparate need of rubber, and you only have one or two options, sure, you can stick on whatever you find, to get you out of a bad situation. You just need to realize that you have no idea how your tyres are going to behave, so take it easy going down the road, look to correct the mismatched tyre situation at the earliest opportunity.
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quastdog
Seattle, Washington USA
F650GSDakar
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quastdog
Chiang Mai, Thailand
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