I’m afraid space saving isn’t something you can (or should) do with guinea pigs, especially boars. I would strongly advise you buy a new cage as soon as possible. The cage that you bought them is not at all suitable for guinea pigs.
If it’s the one I found then even the platforms aren’t usable. The dimensions also mean it falls short of the minimum 120x60cm for a pair of sows, a sow/boar pair or a single piggy. This space is a requirement for one level. Additional levels don’t count towards space because guinea pigs aren’t naturally climbers. They’re ground roaming animals so need the space to be in one level.
Boars need minimum 150x60cm, although we now recommend 180x60cm being better. Your boys are still young but when they reach their teenage months (4-14 months of age), lack of space can be the nail in the coffin of their bond.
When you do get a new cage, use the soiled bedding from their current one when you move them over. This will reduce any kerfuffles that may occur due to territory change.
Depending on where you got them I would sex them to be sure. If they’re from a reputable rescue then it should be fine. If they’re from an individual, breeder or pet shop I’d strongly advise you double check. I’d also book them in for a vet check. When did you bring them home?
Have a read of the guides I’ll link below. I’m sorry you have been misinformed.
Vet Locator
New Owners' Most Helpful How-To Guides and Information
Cage Size Guide
A Comprehensive Guide to Guinea Pig Boars
I know it’s a lot to take in so read through and ask any other questions here. I hope it’s not been too overwhelming. We all want you to help keep the boys’ bond intact.