How old are your Boars Alikateross? If they are 'teen' anything from 3-months to a year then i would not risk introductions yet. I would reccoemnd you keep them next door to one another if they are indoor wire cages, or facing one another in hutches. Once they are over a year old their rush of hormones will begin to lessen and you will see true charcters comming through. Then is the time to introduce them, make a holding pen or a secure room and let them meet on neutral ground. Often a smell pen or on the sofa works best. Guinea Pig language can be quite complex but don't interfere with anything unless they have a proper fight. This will be unmistakable to a little nose in the air squabble and will likely cause injury to one or both. There will be lots of noise, rumbling, teeth chattering, and stiff legged bottom swaying.
Keep them in their little pen/run and observe - they fall out very quickly so you should be sure within a few days if it will last.
If all is sucessfull they need a big cage, bigger is better with boars, newly bedded - if you can put some used bedding they have both been one and mix it in so smell is familiar to them.
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